Looks like this issue is visible only after using a third party software to uninstall the app.
To remove the extension, I has to install a different version of the app (and extension). The blocking extension was correctly terminated and the new one was enabled.
Then, deleting the app directly from the Application folders (without any third party software involved) worked perfectly and the extension was correctly terminated.
MrZnuk
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Hi,
Looks like it is fixed on Monterey 12.3!!
Hi,
It's done: FB9737187 (Third party app sidebar icons not following accent colour on macOS 12.0)
Thank you for your feedback.
Regards