branch names cause "Directory name too long" errors in UpdateExistingPR

As seen here: https://devdiv.visualstudio.com/DevDiv/_releaseProgress?_a=release-environment-logs&releaseId=704327&environmentId=3863967
There were two branches: `dev/vrbhardw/mergedFakesServicing` and `dev/vrbhardw/fakesServicingValidate`, along with the repo name that probably caused this error as changing `dev/vrbhardw/fakesServicingValidate` to a shorter name fixed the issue.

Is there a defined limit on what the character limit of the branch or combination of branches should be?
Also, is there a way of increasing this limit since the length of the branch names used seem reasonable.