Trouble Understanding ParseError with Date Type in Struct

ts 
ParseError: Struct (Type side)
  ["metadata"]
    { readonly floatProjectsSyncLastSyncedAt?: Date; readonly togglProjectsSyncLastSyncedAt?: Date } | null
      { readonly floatProjectsSyncLastSyncedAt?: Date; readonly togglProjectsSyncLastSyncedAt?: Date }
        ["floatProjectsSyncLastSyncedAt"]
          Date
            From side refinement failure
              Expected DateFromSelf, actual "2025-10-12T11:05:48.154Z" 
      Expected null, actual {"floatProjectsSyncLastSyncedAt":"2025-10-12T11:05:48.154Z"}