Thank you for reporting this happening again, and . We currently have a bug report in for this issue back from 4.8 which was never technically fixed. The issue kind of disappeared with 4.9 so we assumed that it was gone and there was no way to test if a fix would work when you can’t get the issue to happen. I’ve bumped the report to let people know that it’s occurring again so that it has some attention now.
On another note, even back in 4.8, we never got this issue to reproduce on Perforce so that bug report is only mentioning steps for Subversion at the moment. The hope is that fixing one will fix both, but to be sure, would it be possible for you to provide some reproduction steps on getting this to happen with Perforce?