Last time I wrote that the iMac was sentenced to death, but it turned out to be a happening. It seems essential to check and record whether this problem is reproduced on other computers.
Today, the exact same issue occurred again on my spare MacBook Pro.
Therefore, when I requested claude to diagnose the cause.. sway compositor died with SIGBUS, and recommended MemTest86+ again, saying it was a hardware issue...
Since the same symptoms were reproduced on the previous iMac, I asked for an alternative, saying that the hardware issue is FP (False positive).
Well, it's because the probability of simultaneous hardware issues occurring on Apple computers I'm using is lower than the credibility of a software bug in sway-related WM.
However, since the alternative was already installed and the problem occurred with sway-git, he suggested considering switching to sway-git.. So I chose to migrate to hyprland.

Therefore, I'm using hyprland and testing it out... There haven't been any unusual occurrences yet.
Of course, the iMac has been using hyprland as its main system for a long time, and now I'm testing hyprland on the MacBook Pro.
Come to think of it.. I didn't migrate the keymap settings used in sway and deleted the whole config directory. I have to rescan the key codes...