Oh, I have now seen a difference that could have led to the misunderstanding. It could have to do with vertical and horizontal. The description of memorial=plaque says that it should be placed vertically. That wasn't so decisive for me.
If this is important, we should discuss how to solve it.
Either we expand the definition of plaque or add a new tag.
(In German, plaque is only used in connection with the dentist)
