I’m using Onlyoffice 18.104.22.168 & Nextcloud 22.2.3 without issue.
I did a clean install of Onlyoffice 7.0.0-132 amd64 docker version on Ubuntu 18.4.5.
after installation onlyoffice the example worked fine.
When I do the Newtxloud integration, I can open and save Excel files without any problems.
When I open Word files I cannot make any changes and all controls seem to be disabled.
For this problem, I opened a case on onlyoffice github before.
They think the problem might be in the nextcloud configuration.
I would be glad if you can help.