When you're in the "Search" tab of the creative inventory, you can't close it using the key you binded to "Open / Close Inventory". This makes sense if that key is supposed to write something, but the problem is that it no longer works even when binding a key that doesn't write anything (I use "Enter", and tried as well with "Backspace", "Left Shift", "F7", "Prt Scr" and "Pause").

It is still possible to close the inventory using "Escape", or of course by simply switching to another tab before pressing the key we binded for that, though, but it's better to close it directly when the key you use allows to do that.

EDIT : I did search for that issue before posting but couldn't find anything. Now I see duplicates of two other bug reports with that, and it's said there it's "intended".
I'm honestly not sure about that, since it WAS working before (as long as using something else than a key that can write). So why would that change ? It may not be the most annoying bug ever, but it was useful to be able to close the inventory despite being in the search tab. And, as far as I know, there's no reason to stop that from being possible. Yes we can use "Escape", but that's not the key I binded for that, that's not the one I would bind even if I could, it's far from the keys I use (being left-handed, my hand for the keyboard is more around the arrow keys. No need to tell pressing "Escape" is anything but handy). And yes I can switch to another tab, but that's annoying if I often need to get something in the search tab (which is the most convenient one to find what you need).