Due to the bug described in SERVER-49416, it appears that some tests were skipping fast count validation even though they did not execute unclean shutdowns. During development on the fix for SERVER-49416, it was discovered that some of these tests were failing with fast count validation errors. We have temporarily set TestData.skipEnforceFastCountOnValidate=true in these tests until we have proper time to investigate whether they really should skip fast count validation or whether they may be exposing legitimate bugs. We should investigate each TODO associated with this ticket to see if fast count validation can be safely disabled or whether it should be re-enabled.