I have a dwg file, in which I inserted a block with the name td_dimension7, when I paste another file that contains the same block, but modified, the original file and the copy make me see the block twice, or modified the new block with the old value.

The workaround is exploding in the first drawing, then clean the file, and at the end copy.But I would like to understand why it behaves like that.

See attached image and original file