Filtering reports by the koha version they work with allows for better relevance in search and discovery of reports from mana. The information of working/not working is not absolute : it is generated from mana, with the script from https://gitlab.com/koha-community/koha-mana/-/merge_requests/19 The script tests each report with empty runtime arguments on the database from each of the latest versions. The script don't take into account the marcflavour parameter, to allow librarian to get report from the other marcflavour and adapt it to the other one. The idea is to only have the reports that are tested for the database schema of the present version of koha.
*** Bug 40921 has been marked as a duplicate of this bug. ***