Unfortunately that doesn't really help. I'm trying to get the BB code in the state that triggers the bug. The bug will be related to the rich text editor parsing in some way (there are a few parts). By getting the BB code in the state before it happens (but when it would happen if edited), I will be able to reproduce it. I haven't been able to reproduce it with th example post.
Alternatively, if there's a post where it is happening, you may be able to use the edit history tool to get the original version of the post (before editing) with the raw BB code. That could help me reproduce it.