Rolled back to 1.2.0 (Android) but blockers stopped working

Description of the issue:
Tried new version but my phone can’t handle it, very laggy. So rolled back to 1.2.0 but adblockers stopped working.
How can this issue be reproduced?
Installed new version from apk file(no access to google play).
Deleted the browser then re-installed 1.2.0, also from apk.
Ad-blocker stopped working (all turned on in settings).
Used the 1.2.0 version for about 2 years without big issues until I updated then roll-back.