The 3rd enchantment slot, however displays both the preview enchantment and has its correct function. The 1st and 2nd, however, do not have either of these functionalities. Tested with various tools with 31 lvls in Survival.
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This is very hard to reproduce, due to the nature of enchantment table, but we can tell you this bug definitely is a thing that exists. I'll post after I've reproduced it.
Apparently, this seems to only work on fishing rods. To reproduce it, you have to keep enchanting fishing rods on first slot enchantment until you get this bug. This occurs very randomly, from my short test, the amount of attempts it took was between 5 to 27 attempts until this bug occured. Here are some pictures of what it looks like:
[media]You can't see it, but my mouse is hovering on the first slot. As you can see, no preview can be seen, and it cannot be clicked.
However, I couldn't reproduce this on the second slot enchantment. Should I make a new post about this?
Edit: oh this is duplicate of MC-36937
Cannot reproduce, all three slots work fine for me.