I installed the docker image of 10.5 a few days ago, but I have encounter this bug

super: no superclass method `hierarchy=' for #<Relation >
https://community.openproject.com/projects/openproject/work_packages/32594

Supposedly this issue is not present in 10.4.1, Can I downgrade with out loosing all of the projects and tasks I have added?

As was suggested in the comments on the issue restarting the docker container got it working.