Thank youAccording to the dumps you provided the other system really isn't providing any fan information via IPMI. The difference is most probably due to different firmware versions.
But those machines aren't absolutely identical either as the mainboard versions are different:
J17012-503 - no fan
J17012-551 - fan
SE5C620.86B.02.01.0008.031920191559 03/19/2019 - no fan
SE5C620.86B.02.01.0009.092820190230 09/28/2019 - fan
Try to upgrade the BIOS/firmware on the system if that will help.