NumPrimaryGuards is set to 6, but the log file keep reports that is missing descriptors for 1/3 of our primary entry guards

A Tor instance running with NumPrimaryGuards = 6 and NumEntryGuards = 2 will report:

Sep 05 03:22:50.000 [notice] Our directory information is no longer up-to-date enough to build circuits: We're missing descriptors for 1/3 of our primary entry guards (total microdescriptors: 6515/6541).
Sep 05 03:22:50.000 [notice] I learned some more directory information, but not enough to build a circuit: We're missing descriptors for 1/3 of our primary entry guards (total microdescriptors: 6515/6541).

We expect to run with 6 primary entry guards and use 2/6 of them all the time, so it should complain about missing descriptors for 1/6 or our primary entry guards. Or maybe this param is not processed correctly and updated in the state file.

When NumPrimaryGuards changes its value, we should sample more guards as primary in the existent state file, or create one if it doesn't exist with the right number of primary guards.