Hotbar slot 2 is not working and glitches

The second bot bar slot isnt working and it wont let me put anything into it the only way is to pick something up then it appears but then i cant switch it out also when im rideing a boat but the boat I was in was a chest boat dont know if that matters but when im in the boat and im useing the slot 2 then it doesnt let me switch out of it nor change it with another items its really annoying and so was the sign up process to make a bug report thank you for reading I hope this gets fixed.