Thank you, I can reproduce it now.
We will fix it in the upcoming release.

Are you able to email me your workspace export to jan.blaha@jsreport.net?
Or please try to isolate the problem by removing your folders to find out which entity is the cause.

It works for me in latest as well as in the 4.10.1.

Please share details when it happens.

Im not sure what you mean...
If you want field value to have black text, just use
color='#000000'

Write your own helper that will evaluate handlebars code
Something like this

function evaluate() {
    return Handlebars.compile('{{#if true}}hello{{else}}nothing{{/if}}')(this)
}

Try value attribute

 {{{pdfFormField name='firstName' value='hello world' color='#FF0000' required=true type='text' width='200px' height='20px'}}}

I apologize if I missed something. It’s been a long time since I last worked with .NET...
I don't see the jsreport.Client would be dependent on the System.Text.RegularExpressions

Could you check the following?

dotnet list package --include-transitive
dotnet list package --vulnerable --include-transitive

I appologize for the delay.

I don't have an idea what could be wrong. Maybe, removing the report entity works, but removing the blob fails. However you should notice this in the logs.

I would need you to compress and send me the whole app, and also attach the render request you called to replicate it.
jan.blaha@jsreport.net

What does the last part of the statement refer to with 'undefined report(s) deletion per run'?

That seems to be just a logging issue fixed in the 4.9.0

There is nothing in the logs related to cleanup other than an acknowledgement of the settings.

That is strange, when I run with the short interval, I can immediately see the cleanup logs (at the end). Could you double-check the same and compare with your setup?

C:\work\jsreport\jsreport>docker run -p 5488:5488 -e extensions_reports_cleanInterval=5s -e extensions_reports_cleanThreshold=1m jsreport/jsreport:4.8.0
2026-04-28T19:05:09.581Z - info: Initializing jsreport (version: 4.8.0, configuration file: jsreport.config.json, nodejs: 18.20.5)
2026-04-28T19:05:09.582Z - info: Searching for available extensions in /app/
2026-04-28T19:05:09.583Z - info: Extensions location cache not found, crawling directories
2026-04-28T19:05:09.694Z - info: Found 35 extension(s)
2026-04-28T19:05:09.702Z - debug: Writing extension locations cache to /tmp/jsreport/core/locations.json
2026-04-28T19:05:09.702Z - debug: Discovered 35 extensions
2026-04-28T19:05:09.729Z - info: Using extension authentication@4.2.3
2026-04-28T19:05:09.781Z - debug: Extension authentication@4.2.3 was disabled
2026-04-28T19:05:09.781Z - info: Using extension base@4.0.0
2026-04-28T19:05:09.784Z - info: Using extension child-templates@4.1.0
2026-04-28T19:05:09.784Z - info: Using extension cli@4.1.0
2026-04-28T19:05:09.785Z - info: Using extension components@4.0.2
2026-04-28T19:05:09.786Z - info: Using extension data@4.1.0
2026-04-28T19:05:09.786Z - info: Using extension express@4.2.0
2026-04-28T19:05:09.898Z - info: Using extension freeze@4.0.0
2026-04-28T19:05:09.898Z - info: Using extension fs-store@4.1.0
2026-04-28T19:05:09.936Z - info: Using extension handlebars@4.0.1
2026-04-28T19:05:09.937Z - info: Using extension import-export@4.0.6
2026-04-28T19:05:09.940Z - info: Using extension jsrender@4.0.0
2026-04-28T19:05:09.941Z - info: Using extension licensing@4.0.4
2026-04-28T19:05:09.959Z - info: Using extension localization@4.0.1
2026-04-28T19:05:09.959Z - info: Using extension npm@4.0.0
2026-04-28T19:05:09.962Z - info: Using extension pdf-utils@4.3.0
2026-04-28T19:05:09.964Z - info: Using extension reports@4.1.3
2026-04-28T19:05:09.965Z - info: reports extension has enabled old reports cleanup with interval 5000ms, threshold 60000ms and undefined report(s) deletion per run
2026-04-28T19:05:09.966Z - info: Using extension tags@4.0.1
2026-04-28T19:05:09.966Z - info: Using extension text@4.0.2
2026-04-28T19:05:09.966Z - info: Using extension version-control@4.1.0
2026-04-28T19:05:09.969Z - info: Using extension assets@4.2.1
2026-04-28T19:05:09.973Z - info: Using extension authorization@4.1.0
2026-04-28T19:05:09.974Z - debug: Extension authorization@4.1.0 was disabled
2026-04-28T19:05:09.974Z - info: Using extension browser-client@4.1.0
2026-04-28T19:05:09.975Z - info: Using extension chrome-pdf@4.1.1
2026-04-28T19:05:09.976Z - debug: Chrome strategy is chrome-pool, numberOfWorkers: 1
2026-04-28T19:05:09.977Z - debug: Chrome custom launch options are args=--no-sandbox,--disable-dev-shm-usage, executablePath=/usr/lib/chromium/chrome, protocolTimeout=60000
2026-04-28T19:05:09.977Z - info: Using extension docx@4.7.0
2026-04-28T19:05:09.978Z - info: Using extension html-to-xlsx@4.2.0
2026-04-28T19:05:10.070Z - info: html-to-xlsx detected chrome as available html engine
2026-04-28T19:05:10.070Z - info: Using extension pptx@4.4.0
2026-04-28T19:05:10.071Z - info: Using extension scheduling@4.1.0
2026-04-28T19:05:10.082Z - info: Using extension scripts@4.2.0
2026-04-28T19:05:10.082Z - info: Using extension static-pdf@4.1.0
2026-04-28T19:05:10.082Z - info: Using extension studio@4.3.0
2026-04-28T19:05:10.112Z - info: Using extension xlsx@4.4.0
2026-04-28T19:05:10.113Z - info: Using extension public-templates@4.0.0
2026-04-28T19:05:10.113Z - debug: Extension public-templates@4.0.0 was disabled
2026-04-28T19:05:10.113Z - info: Using extension sample-template@4.0.1
2026-04-28T19:05:10.114Z - info: Using extension studio-theme-dark@4.0.0
2026-04-28T19:05:10.115Z - info: Using general timeout for rendering (reportTimeout: 60000)
2026-04-28T19:05:10.115Z - info: Using fs provider for template store.
2026-04-28T19:05:10.117Z - info: fs store is persisting using fs for /app/data
2026-04-28T19:05:10.121Z - info: fs store is loading data
2026-04-28T19:05:10.129Z - info: fs store is initialized successfully
2026-04-28T19:05:10.132Z - debug: studio default theme is: light
2026-04-28T19:05:10.134Z - info: Creating default express app.
2026-04-28T19:05:10.142Z - info: jsreport server successfully started on http port: 5488
2026-04-28T19:05:10.143Z - info: Verifying license key free
2026-04-28T19:05:10.143Z - info: Using free license
2026-04-28T19:05:10.152Z - info: Migrating templates chrome settings (waitForNetworkIddle -> waitForNetworkIdle)
2026-04-28T19:05:10.154Z - info: Migration successful
2026-04-28T19:05:10.155Z - debug: Creating samples is disabled
2026-04-28T19:05:10.155Z - info: Initializing worker threads
2026-04-28T19:05:10.155Z - debug: Extensions in workers: base, child-templates, components, data, express, handlebars, jsrender, localization, npm, pdf-utils, reports, text, version-control, assets, browser-client, chrome-pdf, docx, html-to-xlsx, pptx, scripts, static-pdf, studio, xlsx
2026-04-28T19:05:10.418Z - info: 2 worker threads initialized in 263ms
2026-04-28T19:05:10.418Z - info: Starting temp files cleanup with 180000ms threshold
2026-04-28T19:05:10.418Z - info: reporter initialized
2026-04-28T19:05:14.967Z - debug: Cleaning up old reports
2026-04-28T19:05:14.969Z - debug: Cleaned 0 old reports
2026-04-28T19:05:19.969Z - debug: Cleaning up old reports
2026-04-28T19:05:19.969Z - debug: Cleaned 0 old reports

What jsreport version do you use? What template store do you use?

With the debug logs, you should see this

Cleaning up old reports
Cleaned ${removedReports} old reports

and when something fails you should see

Failed to clean up old reports

Could you share these logs?