Hello everybody, i discovered something weird and i don't know how to fix it.

I have a page containing two content areas (CA1 and CA2). Also, i have a block (B1). CA1 is set to allow B1 and CA2 is set to not allow it (check code). 

[AllowedTypes(typeof(AllowedBlockName),
            RestrictedTypes = new[] { typeof(B1)})]

After this, i create a new B1 block in assets pane. I try to drag it to CA2 but nothing happens (as expected). I try to drag it to CA1, CA1 accepts it (as expected). Next I try to drag it from CA1 to CA2 and ... it is accepted (not ok). If I drag again another instance of B1 to CA1 and publish on the page i will have two B1 blocks. 

Also, my CA1 is limited to only one block so i am 100% sure that the rendered block is part of CA2.

How can I fix this issue. Happened to someone else? What did you do?