That sounds like a bug with the addon rather than the game
This isn't a bug, Minecraft Windows 10 places blocks in a line.
They do, you're probably doing it wrong.
If you tap, it does nothing
If you hold, it will launch
Same with me but I might think it has more to do with the device's touch interface rather than the game
This could be because mobile players doesn't have the same reflexes as PC players because controls are harder on mobile.
Turns out that this issue has to do with spawning/logging in at unloaded chunks causing the player not to function. The only way to fix it is to restart the server hoping that the chunk will reload. I don't know if this has been patched since I play Java more now.