Yes, this is still an issue.
The problem is, you cannot do anything EVEN while crouching. When you are crouching, you can do anything while looking at a block with a right click action(chests, furnace, crafting table) but command blocks dont work.
Disabling resource packs seems to fix the issue, but the fact that this could happen, even with resource packs that just modify the music is already not good.
Yes, but all they do is modify the music but not the textures.
think this happens when you die while swimming
This is still a valid issue in the latest version.