I had the same issue as above. The letter stays in the door but is invisible and you can keep picking it up but can't get past the door :o
Damn! I’ll upload a fix in a few. And again - thanks for letting me know! Really appreciate it.
Fixed version uploading now! Ha I added something to the letter to make it's hitbox slightly larger *right* before packaging the final build...and I thought, it's so insignificant, what could go wrong? Valuable lesson learned....
Fix uploaded! :)