Problems typing words that consist of only a Thai vowel or diacritic

Memrise Bug Control Android Bugs
1

If you have a thai word that is only a hyphen and a vowel that is written above or below the consonant or any of the thai tone makes then you cannot correctly type it and receive credit. As soon as you enter it before even hitting the check button memrise marks it wrong.

These are the problems:
Above: -ิ -ี -ื -์ -ํ -ึ -้ -็ -่ -๋
ฺBelow: -ุ -ู

Here is a video of it in action: Link

2

Same problem here and if you try to change from typing to choosing the answer the app shutdown and restarts.

3

Apparently, these simply aren’t possible on the memrise app or website. These features aren’t supported. The problem has been reported elsewhere, to my knowledge, it’s been around for a while.