A click on the group arrow to expand or collapse the contents of any group as in the image below will usually have no effect on Windows 11. The tip of an arrow curser should be somewhere between the arrow and the group name to be effective. Double click on an arrow will also sometimes bring jup a dialog with the message "No data to display in and object with a NULL dataspace."
Comment from @jhendersonHDF:
Windows has an odd issue around opening the groups it seems like. The groups open instantly for me, but clicking directly on the arrow doesn't work, it needs to be a bit right of the arrow. double clicking on an arrow also opens an error dialog that shouldn't be there. Looks to be possibly a mix of SWT issues and issues on our side.