I discovered this bug while messing around a sethome datapack which uses /execute commands to tp u to you home while in other dimensions.

In order to trigger this bug you must have a lot of exp and u need to be in any dimension and you have to be in survival so you can see the exp bar (Also this only works in singleplayer I tried multiplayer and it seems to be fixed).

So to trigger the bug be in the nether or end and do /execute in minecraft:<dimension> run tp ~ ~ ~ then you will see the exp bar is completely 0 but now get a diamond sword and enchant it with anything in the anvil and you will the see costs seems to be red which means u don't have enough exp but clicking the sword at the end of anvil completes the enchant and your exp bar will realized its being used and it will update.

I think this is a visual UI bug so I hope this gets fixed in the upcoming 1.14.2 (I also tested this in 1.14.2 pre-releases and it still shows up)