Problem using iDRAC 7.20.10.05

Server Dell PowerEdge T360 with DELL PERC H755

iDRAC , BIOS  and PERC latest versions

After updating iDRAC to the latest version available on the product page (Dell website) i.e. iDRAC 7.20.10.05 the rear fan (page 18, position 4 in poweredge-t360-technical-guide.pdf) periodically starts at maximum speed for a short period of time (up to a few minutes).
It is annoying and can be a cause for concern!
Rolling back to the previous version iDRAC 7.10.90.00, A00 (Maintenance -> System Update -> RollBack) seems to solve the problem.
Could it be a sensor set incorrectly in the new version that is causing the problem?