This problem is fixed in the nightly build. I updated about 3 weeks ago to the KStars 3.5.6 beta and this sorted out the problem.
I previously reverted to polar aligning with Sharpcap as an interim solution until it got sorted in the nightlies. It is likely to be fixed in the next stable update of Astroberry. I think that if winding back your Astroberry version has given you back the functionality you may just have to wait for the stable update.
An alternative is to create an SD card running Ubuntu Mate 20.04 LTS and download the nightly version which is functional and use it as a standby solution until Astroberry updates.
If you are unsure how to do this here is a link to Chris Kovacs You Tube site that contains some very helpful video tutorials.