Same problem on 1password.

As a mobile developer I can tell you that working with Android keyboards has been a giant fucking pain in ass since inception to today.

While I can't speak specifically to why they both seem to have this problem, I wouldn't be surprised if the OS is part of the problem.

I wouldn't be shocked that if someone had it working consistently, it might be because of the most heinous hacks, or private greylisted APIs or some other nonsense.