No.
Any serving soldier who'd once held a Brevet but had reverted to his previous enlisted rank would have known the rules, and would have abided by them, or he would not have sought further service.
In most cases, the Brevet ranks went to Volunteer units and not to the Regulars - that's where Custer advanced when he commanded the Michigan Wolverines, only to revert back to his Regular Army rank of Captain after the Civil War.
No - my answer is the same, because the reality of the times demanded a certain level of Honor from those who served, and they lived up to it, just like they were expected to.
If they couldn't live up to those demands, and wanted extra attention, then they left the harsh world of the Service and its Customs and became civilians.
Scouts Out!