Update from @unknown
Summary:
Sometimes when loading the world slowly, blocks can be temporarily removed by interacting with them (blocks are restored after a while). This also affects survival.
Steps to reproduce:
Create a new world (experiments are not required).
Fly in one direction without stopping periodically trying to interact with the blocks.
If the blocks do not disappear, set the render distance to a larger value.
Observed results:
Blocks sometimes disappear when interacting with them and are restored after continuing to load the world.
Expected results:
Blocks should not disappear when interacting with them.
Original description:
In the latest preview, Brush were added. If you set your gamemode in creative and then load chunks, you can use the brush to dig any blocks you want and instand break them.
Video:
https://drive.google.com/file/d/1d66gminLuxSacPassiFtML1vqe1Ny8Mg/view?usp=sharing
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I can confirm. But I will add that this is only visually. After a few seconds, the blocks are returned.

I could not reproduce, is this still an issue?

It's still an issue yes
This problem affects not only the use of Brush. Any interaction attempt deletes the block. This can also happen after teleporting to an unloaded location.
I can't reproduce this in any way in version 1.19.70, but I can reproduce it very easily in 1.19.80.21. It seems to be related to chunk loading, sometimes it partially freezes the world as when loading is resumed blocks are returned.
I have updated the report.

Affects Preview 1.20.0.24: see attached file.
[media]Works in survival mode as well as creative. It's crucial that this is fixed, you can even fall through bedrock and die. (Would have been a longer video, the 10mb limit isn't exactly useful ;p)

Affects Preview 1.20.20.22

Still affects Preview 1.20.50.20, why mojang not fixing it?

Also for me this isnt few seconds for its few minutes

Affects 1.20.50.21 still

Affects 1.20.50.22

Affects 1.20.50.23 but now it faster bringing back blocks that destroyed

Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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