This thread showed up when I searched the forum for "genie effect problem", as I have seen this chopped animation every now and then lately, when unhiding an app from the Dock. Perhaps once a day. Often that would be Mail.
This is on my new M2 Pro Mini. I've never seen it before, on my previous M1 and M2 mac minis, running Big Sur or Ventura (or the two weeks I tried out Sonoma, for that matter), with varying amounts of memory. Mostly using the same monitor configuration and the Dock on the right side, in auto-hide mode, and I haven't been using Stagemanager since trying it out for a few weeks when it was new.
I've chosen the zoom instead of "genie" option now, and I'll see if that helps.
(I do suspect that this is akin to the "SOCD watchdog expired" kernel panic that happened on my M1's, which I and others speculate would be something wrong deep in the SOC/unifiedmemory design of the M processors.)