It kinda makes sense for you to be able to break paintings in adventure mode, but in visitor mode, not so much...
This isn't that big of a problem but i would like to suggest that paintings shouldn't be breakable in visitor mode. This sometimes ruins some of your prodjects and takes time to get the paintings you want again if someone has "griefed" your world.
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Duplicate of MCPE-22181
It doesn’t make sense to be able to break paintings in adventure mode. I avoid using paintings because of this bug. On java edition you can break paintings by pressing left click very often, but not ba simply clicking in adventure.