Wget - how can I --convert-links and avoid redownloading already fetched files?

I am downloading data spread among multiple files that is not changing once published.

Therefore --timestamping is not good enough - it is constantly checking whatever resources were changed, what in my situation is completely pointless.

--no-clobber would fit perfectly, unfortunately for some reason it refuses to work with --convert-links.

Both --no-clobber and --convert-links were specified, only --convert-links will be used.

I hoped that --backup-converted will help (it works for --timestamping) - but it changed nothing.

tl;dr - why

wget --convert-links --backup-converted --no-clobber --wait 1 https://example.com

ignores --no-clobber and how it may be fixed?