stuck in downgrading from setFeatureCompatibilityVersion: “6.0” to “5.0”

Hi All,

I upgraded from mongo:5 to mongo:6 and I did the last step which was:

db.adminCommand({ setFeatureCompatibilityVersion: "6.0"})

Everthing was fine till for some reason I don’t know the FeatureCompatibilityVersion was downgraded to “5.0” and I’m trying to find why.

The real problem here is the downgrading is not done successfully, it’s stuck and I can’t complete it or cancel it.
in other words, watch the following commands and responses:

rs0 [direct: primary] test> db.version()
6.0.17
rs0 [direct: primary] test> db.adminCommand({ getParameter: 1, featureCompatibilityVersion: 1 })
{
  featureCompatibilityVersion: { version: '5.0', targetVersion: '5.0', previousVersion: '6.0' },
  ok: 1,
  '$clusterTime': {
    clusterTime: Timestamp({ t: 1725733102, i: 1 }),
    signature: {
      hash: Binary.createFromBase64('AAAAAAAAAAAAAAAAAAAAAAAAAAA=', 0),
      keyId: Long('0')
    }
  },
  operationTime: Timestamp({ t: 1725733102, i: 1 })
}
rs0 [direct: primary] test> db.adminCommand({ setFeatureCompatibilityVersion: "5.0" });
MongoServerError[CannotDowngrade]: Cannot downgrade the cluster as collection shops.ShopReviews has 'changeStreamPreAndPostImages' enabled
rs0 [direct: primary] test> db.runCommand({ collMod: "shops.ShopReviews", changeStreamPreAndPostImages: { enabled: false } })
MongoServerError[InvalidOptions]: BSON field 'changeStreamPreAndPostImages' is an unknown field.
rs0 [direct: primary] test> db.adminCommand({ setFeatureCompatibilityVersion: "6.0" });
MongoServerError[Location5147403]: cannot set featureCompatibilityVersion to '6.0' while featureCompatibilityVersion is 'downgrading from 6.0 to 5.0'
rs0 [direct: primary] test> db.adminCommand({ setFeatureCompatibilityVersion: "6.0", confirm: true });
MongoServerError[Location40415]: BSON field 'setFeatureCompatibilityVersion.confirm' is an unknown field.
rs0 [direct: primary] test>

I tried restarting the engine but no luck.

How can I get out of this deadlock without dropping the collection?

Thanks in advance.