On my side, I am not going to spend one more minute in issues regarding logging or diagnostics in SuiteCRM until my PR’s get merged: Improved Diagnostics and Improved logging.
I haven’t tried this last one on SuiteCRM v8, but if you have some sort of test server you can try it, it might work. It’s different code than the one currently giving you problems; and you get stack traces that are a lot better, as you can see by the documentation preview that I link to in that PR.