One small remark from my side.
You can do an snmpwalk/get to get the OID .1.3.6.1.2.1.1.2.0
Now you can compare the output for booth of your PDUs. What shows the “not working” one under this OID?
With the output from this OID CheckMK decides what check should work on the device as it is something like the device identifier.
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