This issue has not been present in previous version, including the previous 1.17 beta. The map I am creating revolves around the use of preventing players from going out of bounds. I would like this issue to be solved soon, if possible. Here are the steps:

1. In Creative Mode, /give @s barrier blocks.
2. Place the barrier blocks anywhere.

Although the barrier blocks cannot be broken if targeted, in fact the blocks surround it are broken instead, I am able to move against and jump on top of the barrier. The steps are simple, and I'm not sure how this issue appeared to begin with.