First off, this is not a duplicate. I lost access to the accout I made the other report on. Also, this is NOT normal lag. This is the weirdest lag I've seen. It just happens randomly. Chat will work fine, however building, breaking, swimming, chunk loading, entity loading (Mobs can hit you but you cannot fight back as they aren't visible), etc won't work properly during this "lag". I believe this has something to do with the 1.18 update as it happens to so many people. It happens to the host and everyone online. It usually happens when a few or more players are on the world.

best way I can imagine right now to try and recreate this:

1. Load a world.
2. Get a few devices on. Maybe move them around a bit idk.
3. Wait a bit

You may not be able to recreate it. Also, try making sure the world is Infinite. Also try loading chunks, and don't just stay still.

If you find anything about this feel free to comment, and definitely attach any photos/videos of it happening if you can. Also, any ways to stop it and/or prevent it would be great too, however one I have found that sometimes works (to stop it while it's happening) is to type /kill while in Survival Mode. It seems to happen completely randomly.