I had this same bug when planets first came out. Basically players are falling through planets. This is happening server wide, not just for one person.
This issue should be already fixed: https://support.keenswh.com/spaceengineers/general/topic/ghost-issue-falling-through-planetsblocks. If there are any other issues please make a new report.
Keen Software House: QA Department
This is still happening unfortunately :(
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