API issues updating an item

[WayneLovesJelly]

I am attempting to update and item using the API.

I can successfully get the items data using the Items API. 
When I post the same data back I get an exception in the logs,

[2025-11-13 23:03:05.516 +00:00] [ERR] [66] Jellyfin.Api.Middleware.ExceptionMiddleware: Error processing request. URL "POST" "/Items/acabd9e2adb5af9239a5108869b4dc12".
System.InvalidOperationException: Each parameter in the deserialization constructor on type 'MediaBrowser.Model.Dto.TrickplayInfoDto' must bind to an object property or field on deserialization. Each parameter name must match with a property or field on the object. Fields are only considered when 'JsonSerializerOptions.IncludeFields' is enabled. The match can be case-insensitive

I can confirm that my data appears to match the API spec

."Trickplay":{
      "acabd9e2adb5af9239a5108869b4dc12":{
         "320":{
            "Width":320,
            "Height":180,
            "TileWidth":10,
            "TileHeight":10,
            "ThumbnailCount":21,
            "Interval":10000,
            "Bandwidth":2096
         }
      }
   },


This API script had been working in the past but had stopped recently when I enabled truck play and upgraded the server.