I think this bug is partially related to memory usage.
When using the geometry viewer, i saw data from the previous query/preview and the current data needs to be displayed. that happened several time for me.
Additionally in another time it showed black with no map.
For sanity check i looked how the data looks on DBeaver and it was correct.
pgAdmin 4
version 9.10 desktop
commit 60c56b3 2025-11-10