Cannot type chat, command, search items, and anything in the game that related with typing.

I want to teleport to a location, so I typed /tp, but only the slash appeared. I tried to open chat by pressing T, the chat menu appeared but I can't type there, but I can still use the backspace (delete in Mac). I tried in a different world, and the same thing happened. Then I closed the game and when I relaunched it I can type, but after a moment I can't type again. This still happens in the current latest snapshot (18w15a), so I force crashed the game and relaunch it, I can type but after a few moments I can't type again. I can't even search for items in the creative menu, or even make new world and type the seed. I checked the
Chat Options menu and everything seems fine. It's not an invisible text, I just can't type at all, I can only delete letters.