REST API for tags, search... is it not implemented?

Your software
My Mautic version is: 4.x
My PHP version is: 7.4
My Database type and version is: tidb

Your problem
Mautic Developer Documentation suggests that tags support search.
Empirically they don’t seem to, always returning the full set.

Grepping in the source, it don’t see $options[‘search’] in the files relating to tags.
Am i missing something or this is not implemented?