With release of WP 6.4 some admin translations for nb_NO were a bit late, especially the ones for the about page.
After the translation became complete and a new core langauge pack was created, I could install the updated package on my nb_NO sites, all with this plugin active.
Result: The about. page still has English text.
Deactivated this plugin and looked again: A translations is there (Norwegian Bokmål).
Reactivated this plugin: All above strings are back in English.
Looking back in time/memory, I may have observed this update problem with some plugins/themes, but not able to replicate now.
Used plugin a few months, about 10 of 30 sites affected. Ordinary OPcache. Not other plugins for (faster) translations.