I deleted some worlds where I saw this problem. The two worlds I have at the moment are those prepared for the marketplace and that I cannot share due to the NDA. But as I said it's not a world specific problem, all you need is an empty chunk, minus height and some water.
Sorry, i should search better, thank you.
I know that i have to use number, i wrote "x" as a variable
Is there a language related problem because I use translation? Because I'm saying it's not a problem that happens at certain coordinates in a particular world. This problem is happening on "all" worlds. When I say "all" I mean "each instance of its kind", so it's a "general" bug that happens on "every" seed in "all" worlds you'll create in Bedrock version 1.18 or later of Minecraft. It happens at minus/negative coordinates.
For the use of the fill command, you can use the wiki. Rest assured it will work. For the command to work, you don't need a special number value, a secret magic word that you can only hear from me.
I was thinking that this problem could only be on my computer but a few hours after I created this issue I saw another similiar issue. That person was having the same issue with the another blocks(i think it was gold blocks).
Sorry, but I couldn't find it when I searched the issue again.
If you are wondering about the description of water or how to download minecraft feel free to ask. I would be happy to provide more detailed information.