Piggy backing this thread.
Same router, same issue.
Updated to FW v2.3.3.136.
Resynced ping heatmap, and it's still the old list.
Not an issue though.
My PS5 has a static IP, so I removed it from the device list, drew a fresh "fence" using polygon mode, and added the PS5 back in, and now it seems to adhere to the geoblock.
Some light shimmering og jittering from time to time, but that looks to be my PS5 dropping frames.