[Koha] Adding items to a list not possible in Koha 21.11.09

[Michael Kuhn]

Hi Andreas

You wrote:

 > I've tried to reproduce the issue you describe on a development
 > 21.11.09 instance that I set up, but was not successful.
 >
 > So, I have a few questions for you to help me diagnose this ;-)
 >
 > Assuming a package installation, have you restarted the koha-common
 > service following the upgrade?

Yes, we have. We have also restarted the complete host.

 > Have you performed a hard refresh of your web browser's cache? (hit
 > CTRL-F5)

Yes, we did.

 > Finally, which version of Koha did you upgrade from?

We have updated from Debian 9 to 10, then from Koha 19.05.02 to 21.11.09.

Best wishes: Michael
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