Painting are breakable in adventure mode

This is intended, because paintings are entities and you can interact with entities in adventure mode.

Is there anyway we can make painting unbreakable? Maybe with commands or add-ons?

Thank you for your report!
However, this issue has been closed as Working as Intended.

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Why is this intended??? You are not able to break armor stands in adventure mode, so why should you be able to break paintings in adventure mode? Armor stands are also entities. This bugs prevents me from using paintings in adventure map.

And why did this get fixed for creepers being able to destroy paintings when mob griefing is off? It doesn’t make sense for creepers to be unable to destroy paintings with mob griefing turned off if the player is able to destroy paintings in adventure mode.

This is not suppose to be breakable!!! what if I make a big map that has lots of paintings with secret passages behind and I don't want to make the player see them???

This works in 1.20.0 as well.  Players can also place flowers in flower pots and take out flowers from them also.