Unable to change custom skin on iOS 12

The skin bug MCPE-37926 was introduced in 1.7 and I downloaded the game in that version. In 1.8 the crash on trying to use a custom skin for the first time was fixed, which allowed me to attempt to add a skin without a crash. The skin became corrupted and completely invisible, and now in 1.9 even though the bug is fixed my skin refuses to change no matter what.