Will try to figure out what is the problem, it would be hard because I can't reproduce the issue.
But, I have some good news. Version 1.3 will bring a lot of new stuffs. I'm going to give only one example: replacing sprites will work in dynamic replacement.
Edit: After some thinking it won't be any 1.3 version which the updates that I planned.
Sprites in dynamic replacement would be the same as sprites in complete replacement -> better to not.