Some formatting rules are only active in preview mode, so ruff server --preview (used by the LSP in your editor) and ruff format (used by pre-commit) can silently produce different output for the same file.
One example is hug_parens_with_braces_and_square_brackets: it is enabled by default under --preview but off in stable ruff format. The editor reformats the file one way; the pre-commit hook then rejects it.
The quickest fix while waiting for a rule to stabilise is to disable --preview in the editor config, or explicitly opt-out of the offending rule in ruff.toml:
[format]
preview = false
If you do want preview everywhere, pass --preview to the ruff format hook as well so both sides agree.