if you don’t mind I will join this thread as well.
Dear @isNaN, I do believe that the situation is related to your installation methods. In this very situation we need to rule out possible installation issues before continuing the troubleshooting.
Please deploy the Document Server from scratch following official guides:Installation Guides - Docs Community Edition - ONLYOFFICE
If you are using air-gapped server, please try this tested guide: Offline Installation - sourceforge download - #2 by Alexandre
Please follow official guides, re-deploy the Document Server and let us know the result.