It seems to be a bug.
Those properties sometimes shown and sometimes not.
I tried to:
1.Change category
2.Modify display name
3.Remove comments
4.Add misc static mesh components
…
None of them seems to be relative to this issue. Even theres a time one of the static mesh component’s properties were shown but the others weren’t.
I’ve gave up as for now. Anybody who have solved this pls post your solution, many thanks.