Me and my colleague are connecting from a Mac running OSX 10.15.7 and Horizon client Build 8.1.0 (17353466) to a Red Hat Desktop running Red Hat Enterprise Linux release 8.3 (Ootpa) via VMware Blast protocol.
We are not using any of the default Horizon client shortcuts so we did remove all the default key mappings in our Horizon client. In both cases, this leads to the left alt key (keycode 64 in Linux) after a while (~120 minutes) / when starting a new session to be coming up in RHEL as keycode 133 (left cmd / super) in Linux. When we "Restore defaults" and remove all the mappings again, Left alt is again coming up in RHEL as keycode 64.
The wrong keycode 133 for alt, when tested with `xev`, does show exactly the same characteristics as left super. So as far as RHEL is concerned, the Horizon client does seem to actually send the same event for both left alt / left super when the bug manifests.
We think this is a bug in the client. We're happy to have a call to add more data that could help fix it.
