ArcGIS Pro 2.9 on any .aprx doing any kind of geoprocessing tools, will hang after the geoprocessing tool completes, I can close the geoprocessing tool window, but if I click on ANY other feature, Save, Close, etc. the geoprocessing window pops open again.
I must go to Task Manager and end the ArcGIS tasks. This is a significant time-consuming and annoying bug,
Are you sure that that process has been completed? This has happened to me , on occasion, but it's usually because the process hasn't finished even though it says 100%. What I've started doing is checking the "close upon completion" box. Since then, I haven't had any issues.