Tile Entity Disable Inserting dosn't quite work

I'm currently working on a block with GUI. This GUI has multiple slots, but only one slot should be intractable via hopper.

Screenshot of the GUI: https://pasteboard.co/HngS76GQnEPg.png

To achieve this behavior, I entered the ID's of the slot's hopper shouldn't interact with into the "Disable taking from the following slots" and "Disable inserting into following slots" fields.

(Screenshot: https://pasteboard.co/tv1xzEtcGgj8.png)

But now some strange behavior is happening. Hopper can't insert items into the listed slots, but the player can't either!

I made a video of the problem: https://youtu.be/OAlOjZex7uQ

I think this is a bug, but if it isn't, please tell me what I'm doing wrong!