Symptoms
You receive an e-mail notification with backup log, containing one or multiple lines with "Volume Tracker has failed to find changes on volume..."
Example:
2018-12-20T09:00:10:378-04:00 10916 I000101F8: Pending operation 173 started: 'Creating partition image'.
2018-12-20T09:00:11:190-04:00 10916 I00100000: Volume Tracker has failed to find changes on volume '\\?\Volume{5e2aeab2-ffb3-4dab-8444-54635f6a3367}\'.