At first I thought it was the hidden text box and I tried to select all but it can't be selected for some reason.
It's not a slice either.
My Illustrator version is 28.7.1.
Anyone knows what kind of bug is this and can it be removed?
Yep, you have a tiny tiny tiny text box, with overset text (actually just a paragraph return, but your box is only 2 pixels wide by 0 pixels tall.
If you Select All, you will see it over to the right on the pasteboard. You could increase the size by putting larger numbers on the measurements at top right, but as I said it's just a paragraph return, so you should just be able to Select All and Delete.
OR
Object > Path > Clean Up. That should get rid of it.
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