Placed bug repellent blocks are not set to be replaceable (like liquids) nor have a collision box meaning once placed, it is impossible for a survival player to remove the block if they decide they don't want it to be there any more.

Strange. This block should be breakable by the player. Will look in to it.

This is fine. It does actually have a small collision box and the player can break the block in one hit with a fist. Closing due to Funway wasting my time. :P