EDIT: Can confirm the update just fixed this, thanks for the quick fix!
Since the last update, I can’t back out of the Post screen using hardware or in-app back buttons. The only way to back out is to first type something then hit back, which triggers the Stay/Leave popup. Before picking either option it already backs out of and discards the post, then choosing Leave backs out one more screen. Picking Stay does nothing.
Removed by mod