For those still having trouble running mineos-node outside of privilege, I did the following and it works now. The container still crashes when multiple players have joined at different times, but server will at least operate outside of privileged. Trying the other binhex minecraft docker to see if it is more stable.
(I found this during the process of moving over to the other binhex docker because that docker wouldn't even start until I did the following) This is on the support page for the other docker. If this is a duplicate post and someone else has resolved the problem here, my apologies.