The Jenkins slave appears to be trying to write the fingerprints to the local filesystem instead of sending them back to the master.
ERROR: Failed to record fingerprints
java.io.FileNotFoundException: C:\Program Files (x86)\Jenkins\fingerprints\3a\1e\c618d7f09e6c9d736b6df5cccd3e.xml (The system cannot find the path specified)
The Jenkins slave was sending the fingerprints back to the master with the Jenkins version we were running before an upgrade some time between August 1st and 5th.
We have reinstalled the Jenkins slave service, changed the order of the fingerprinting build step, and recreated the job.