You said V9.2 don't have the problem - it's impossible. All versions of Boldbeast Recorder, all other recorders, and all third-party apps in the market, no one itself can bypass the power management / battery optimization limit imposed by the system.
I am not sure why you do not believe me when i and other users on this forum have mentioned that after v9.2 call recording starts to skip.
To test this, i had to put put my phone back on stock android 7.1.2 as v9.2 doesn't work on android 8.
I then made test calls on v9.2 and everything worked fine and recorded fine.
I then went on the play store and allowed boldbeast to update to the latest ver (10.2GP) and the problems came straight back with call skipping. So i know it is something that was introduced in v9.3 that is causing the issue.
The following link shows screen shots during testing of v9.2 & V10.2
This shows the three calls made on v9.2 the call time and record time are both the same.
Then the two calls made on v10.2 the call time is far longer than the record time.
There is no setting on my phone i can adjust to make this work, as its a software issue, and only occurs when the screen is off, as also reported by other users. I am happy to send logfile or whatever is need to get this sorted out.
Hopefully since i have purchased the app, then that should count for getting an element of support from the dev rather than just blaming android.