After update to Backdrop CMS 1.22.0 on Staus report page appeared 2 warning messages:
Cron Queue test:
There are multiple versions of module Cron Queue test in the installation. less
The competing module files are listed below. Only the first of the module versions in the list will be loaded.
- core/modules/system/tests/cron_queue_test.module
- core/modules/system/tests/cron_queue_test/cron_queue_test.module
System Cron Test:
There are multiple versions of module System Cron Test in the installation. less
The competing module files are listed below. Only the first of the module versions in the list will be loaded.
- core/modules/system/tests/system_cron_test.module
- core/modules/system/tests/system_cron_test/system_cron_test.module
Comments
This issue was fixed a while ago in core: https://github.com/backdrop/backdrop-issues/issues/5465
It sounds like when you updated Backdrop the new files were merged with the old, so the old files weren't removed.
Assuming you haven't edited any files in the core directory, you can just delete it, then extract a copy of core from the latest version of Backdrop in its place.
It also did it for me too... so looks like something has unfixed itself :-)