I'm getting the error "Environment variable MONGODB_CONFIG_OVERRIDE_NOFORK == 1, overriding \"processManagement.fork\" to false"

Ops and Admin Replication
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4

Maybe it too late, but I have same problem and I fixed it by:
Step 1: sudo systemctl edit mongod
Step 2: Adding this line [Service] Environment="MONGODB_CONFIG_OVERRIDE_NOFORK="