Space bar key (for jumping) does not work after opening a GUI

When I tried out playing the game using a connected keyboard on my android tablet, it works just fine, however, if I open a GUI such as the the chat, and then go back to the game, I can no longer use the spacebar to jump. I tried to go to the settings and see if I can reset the keybind for the spacebar, so I changed it to another key, then changed it back. When I tried to change it back however, it seems that the game does not register the spacebar stroke at all. The only way I can fix this is restart the game.