Ran a few tests, @ralph you might wana see this
The project node counter seems to be working fine, you reach the limit and you can’t add stuff anymore. Perfectly normal.
But it seems like it’s the movieclip node counter that is broken.
Basicaly, if put too mutch nodes in a movieclip, it ends up overflowing, making the node count negative, wich wouldn’t be a big deal if it didn’t afect the project node counter. But tbh I doubt it’s a grave bug.