Subsonic search3 not returning all songs

Steps to reproduce

Some users asked me to support Funkwhale in my app but I'm facing an issue with the exposed Subsonic API. To sync the whole database I'm using /rest/search3 without a query value (For other subsonic server sending query="" do work).

But for the user who gave me access to his server not all songs are returned this way.

He told me: well the initial import of the songs was done on an older version and they all miss the user attribution for some reason

What happens?

Some songs are missing

What is expected?

I would expect all songs to be returned as for other Subsonic servers

Context

Funkwhale version(s) affected: | Funkwhale version | 1.2.3+git.dc35000d |

I do not know much about funkwhale but pretty sure the user can provide necessary logs or information.