I am on bedrock version 1.20.51 and am also experiencing this issue. I have a structure built on a realm I play on, and while standing at level 255, if I perform any action that requires a right click, I begin taking damage. Air bubbles appear briefly, but disappear. The damage stops if I move out of the area or jump. If I eat food, I will drop through the block I am standing on (an iron block) and drop to a lower level I had to build to prevent me falling all the way to the ground. I first learned of the issue because I was exiting a nether portal at that location and when spawning in, either when exiting the portal, or loading the game at that location, i was dropping through the floor. I also have the periodic issue of placing blocks, but they flash on screen but then disappear as if I hadn't placed them (item is back in inventory).
manspawn
I am on bedrock version 1.20.51 and am also experiencing this issue. I have a structure built on a realm I play on, and while standing at level 255, if I perform any action that requires a right click, I begin taking damage. Air bubbles appear briefly, but disappear. The damage stops if I move out of the area or jump. If I eat food, I will drop through the block I am standing on (an iron block) and drop to a lower level I had to build to prevent me falling all the way to the ground. I first learned of the issue because I was exiting a nether portal at that location and when spawning in, either when exiting the portal, or loading the game at that location, i was dropping through the floor. I also have the periodic issue of placing blocks, but they flash on screen but then disappear as if I hadn't placed them (item is back in inventory).