I’ve just checked and this doesn’t resolve the problem.
Settings > Game Activity > ‘Display currently running game as a status message.’ set to off and even restarting Discord after that (and observing that the setting is still set to off), I still get the following denial repeated over and over:
Oct 20 15:22:12 adam-thinkpad-t430 audit[85081]: AVC apparmor="DENIED" operation="ptrace" profile="snap.discord.discord" pid=85081 comm="Discord" requested_mask="read" denied_mask="read" peer="unconfined"