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If you are trying to add line breakpoint by mouse click at annotation bar in the editor - it's impossible if there is already placed another annotation (e.g. bookmark, ...)
It is possible, however you have to click more precisely (enough to the left of the annotation icon). I'll try to fine-tune this. Also, there used to be a context menu provided by debugger, which is for some reason not available anymore.
There is an issue already tracking this. *** This issue has been marked as a duplicate of 105746 ***
"Also, there used to be a context menu provided by debugger, which is for some reason not available anymore." - Because it duplicated 'Toggle Line Breakpoint' in the editor popup menu.
v/c