Finder still losing sidebar links to folders

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I don't see any of the normal software suspects however I see some pretty old software. My suspicion is you have some outdated software that may be causing a problem. Which app, it's difficult to say.

My suggestion is to go through all of your third party apps and ensure they are up-to-date. After you have done that chore, restart in Safe Mode per the directions in Safe Mode and then restart normally and test.

I see you have a Wacom tablet installed, these have had history of causing issues with Mac OS too so that is where I'd start. If the problem persists with all of your third party apps updated then I'd uninstall the Wacom and test the computer (do another Safe Mode restart after uninstalling) and then test again, if the problem goes away then you have found what was causing it.

Finally I see you have a farm of external HD's connected, it is possible one of them is causing a problem, especially if you use ANY of their apps.

For some reason that WD software is Crashing badly.

If you are using the WD software for backup...? I recommend uninstall it and using something more Mac compatible like CarbonCopyCloner or SuperDuper with external drives.

same problem here. I have a hunch that it happens sometimes after mounting an external disk.

Under 10.14, all the reset Finder tabs at least kept their history, and one could go "Back" to the previously open folder (still annoying). Under 14.6, even the history is wiped (major annoyance).

Diemo,

Please start your own thread and post an EtreCheck report and someone will get back to you. The reason for creating your own thread is your issue and the OP's issue can have similar symptoms but different causes and also it can be VERY confusing to manage both of your problems on the same thread.

WD apps installed on Macs are a known problem on these forums. Den.Thed is correct that the WD software should be uninstalled, moved to the Trash and finally empty the Trash. Then restart the computer and test.