When loading into a realm or server there is a chance that the chunks load incorrectly. The blocks are not visible to the player and they can pass through them, but take suffocation damage. The blocks return to being tangible and visible after re-loading
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[Mod] Umija5895M
Thank you for your report!
We're tracking this issue under MCPE-63268 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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