JabRef 5.2--2020-12-24--6a2a512
Windows 10 10.0 amd64
Java 14.0.2

• Mandatory: I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

This issue is present on the v5.2 stable.

Steps to reproduce the behavior:

1. Select a large number of entries
2. Auto-generate citation keys based on presets
3. No background tasks shown

Would be great if such extensive tasks would show up in the Background task option.