Scenario:

launch BE / Edit contents of selected block,
Pencil symbol shows that this block is now in edit mode,
launch Rename Block / rename it, confirm with ok, dialog closes,
renaming doesn't works, pencil symbol is still on that block,
try to launch rename block again - doesn't work anymore,
return to main drawing,
if I then select this block it will show the new name in the Property editor but not in the block list,
if I try to open this block within the block list again it doesn't works,
if I open this block within a double-click in my drawing it will open but the pencil isn't shown.