surround: Replacing quotes by `[[` & `]]` (via `<M-]>`) does NOT work anymore

[bew]

In config for nvim-surround I made surrounds to easily add/change/delete Lua's [[ & ]] delimiters using <M-[> (with space(s)) and <M-]> (without space).

When I did these I'm pretty sure it worked, and used it a bit afterward, but now I can't use them anymore...

TODO: check last plugin update date, try update, check older version if any, maybe bisect?