Class 'GeorgRinger\NumberedPagination\NumberedPagination' not found when opening gallery

[Jörg Schreiner]

I installed extensions “Numbered_pagination” and “fs_mediagallery”.
When I thry to open the mediagallery in frontend, I get a

Class 'GeorgRinger\NumberedPagination\NumberedPagination' not found

I already uninstalled both extensions, installed them again, flushed cache. Nothing helped.

[Jörg Schreiner]

In extension “numbered pagination”, Georg mentions the class path

\GeorgRinger\NumberedPagination\Pagination\NumberedPagination

…so an additional “pagination” in the path. Can this be the issue?

[Jörg Schreiner]

opcache issue. Despite the fact, that Typo3 should also flush opcache, it seems to further exist after a cache flush in the maintenance.