Hi

We're having problems with the `ObjectSerializer` for the MongoDB.Driver.Core driver version `2.19.0`.

We're storing "fingerprints" of objects where we use dynamic to save the properties used to calculate what we call a "fingerprint"-hash.

We have the following class
```c#
public class Fingerprint
{
[BsonElement("id"), BsonId, BsonIgnoreIfDefault, BsonRepresentation(BsonType.ObjectId)]
public string Id

{ get; set; }
[BsonElement("createdAt"), BsonDateTimeOptions(Kind = DateTimeKind.Utc)]
public DateTime CreatedAt { get; set; }

= DateTime.Now;
[BsonElement("hash")]
public string Hash

{ get; set; }
[BsonElement("data")]
public object Data { get; set; }

[BsonElement("metadata")]
public object Metadata

{ get; set; }

}
```

We're then creating an instance of this object that populate our dynamic fields with C# base types (`int`, `long`, `boolean` etc.)

```c#
public Models.Fingerprint ToFingerprint => new Models.Fingerprint
{
Hash = Fingerprint,
Data = new
{
Data.UserId,
Data.Name,
Data.Type,
Data.Domain,
Data.SiteName,
Data.Role,
Camps = new

{ Count = CampsData.CampCount, NotInvoiced = CampsData.NotInvoicedCount }

,
Club = new

{ ClubData.Id, ClubData.Name, ClubData.AttributeCount, ClubData.AttributeCategoryCount, ClubData.GroupsInClubCount, ClubData.HasActivatedBilling, ClubData.HasActivatedCriminalRecordSettings, ClubData.HasActivatedLokIntegration, ClubData.HasActivatedMembershipCards, ClubData.HasClubLogo, ClubData.HasFacebookConnection, ClubData.KakserviceSaleCreatedAt, ClubData.MembershipInvoicesCount, ClubData.MissingCriminalRecordCount, ClubData.NewbodySaleCreatedAt, ClubData.PersonsCount, ClubData.YoucalAgreementStatus }

,
Package = new

{ Packages.Type, Packages.Package }

},
Metadata = new

{ Data.Id }

};
```

When using Newtonsoft we get the following result

```json
{
    "id": null,
    "createdAt": "2023-02-17T18:06:40.3767748+01:00",
    "hash": "E929580C21FD36E878CCA03E38D95C57CD1DB7507A55965DFD036C2F9BFFE2AF821C616485EDAA7CF68A48E66A153F9A688829E692F440C78B56F7377AC37F5E",
    "data": {
        "userId": 1024439,
        "name": "Eds FF",
        "type": 3,
        "domain": "laget.se",
        "siteName": "EdsFF",
        "role": 1,
        "camps":

{             "count": 0,             "notInvoiced": 0         }

,
        "club":

{             "id": 22633,             "name": "Eds FF",             "attributeCount": 0,             "attributeCategoryCount": 0,             "groupsInClubCount": 44,             "hasActivatedBilling": true,             "hasActivatedCriminalRecordSettings": false,             "hasActivatedLokIntegration": true,             "hasActivatedMembershipCards": true,             "hasClubLogo": true,             "hasFacebookConnection": true,             "kakserviceSaleCreatedAt": null,             "membershipInvoicesCount": 1878,             "missingCriminalRecordCount": 73,             "newbodySaleCreatedAt": null,             "personsCount": 1010,             "youcalAgreementStatus": 2         }

,
        "package": {
            "type": 0,
            "package":

{                 "siteId": 61958,                 "siteType": 3,                 "packageType": 3,                 "daysLeft": 4930             }

        }
    },
    "metadata":

{         "id": 61958     }

}
```

Why can't we longer use `dynamic` as a propety type?

Kind Regards
Erik