After update from older version it's occasionally crushing our server, we did investigation and collected memory dumps:

7f66a91f6cc0 16,368,298  2,095,142,144 System.NullReferenceException

So it contains 16Milions of exception

Stack trace for all 16m exceptions:
00007F2583FFB160 00007F66B1163ECC Npgsql!Npgsql.Internal.NpgsqlConnector+<ReadMessageLong>d__235.MoveNext()+0x2ac 00007F2583FFB290 00007F66B16F8E3D System_Private_CoreLib!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()+0x1d 00007F2583FFB2A0 00007F66B4344DAA System_Private_CoreLib!System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore1[[System.__Canon, System.Private.CoreLib]].ThrowForFailedGetResult()+0x3a
00007F2583FFB2C0 00007F66B1643C38 System_Private_CoreLib!System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore1[[System.__Canon, System.Private.CoreLib]].GetResult(Int16)+0x38 00007F2583FFB2E0 00007F66B4344D06 System_Private_CoreLib!System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder1+StateMachineBox1[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]].System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16)+0x56 00007F2583FFB310 00007F66B1163DCA Npgsql!Npgsql.Internal.NpgsqlConnector+<ReadMessageLong>d__235.MoveNext()+0x1aa 00007F2583FFB450 00007F66B16F8E3D System_Private_CoreLib!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()+0x1d 00007F2583FFB460 00007F66B4344DAA System_Private_CoreLib!System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore1[[System.__Canon, System.Private.CoreLib]].ThrowForFailedGetResult()+0x3a
00007F2583FFB480 00007F66B1643C38 System_Private_CoreLib!System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore1[[System.__Canon, System.Private.CoreLib]].GetResult(Int16)+0x38 00007F2583FFB4A0 00007F66B4344D06 System_Private_CoreLib!System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder1+StateMachineBox`1[[System.__Canon, System.Private.CoreLib],[System.__Canon, System.Private.CoreLib]].System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16)+0x56
00007F2583FFB4D0 00007F66B1FD1FE2 Npgsql!Npgsql.NpgsqlDataReader+d__52.MoveNext()+0x2202
00007F2583FFB4C0 00007F66B16F8E3D System_Private_CoreLib!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()+0x1d
00007F2583FFB4D0 00007F66B1FD23F6 Npgsql!Npgsql.NpgsqlDataReader+d__52.MoveNext()+0x2616
00007F2583FFB5F0 00007F66B16F8E3D System_Private_CoreLib!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()+0x1d
00007F2583FFB600 00007F66B32CA78B System_Private_CoreLib!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions)+0xdb
00007F2583FFB630 00007F66B3153D03 Npgsql!Npgsql.NpgsqlDataReader+d__73.MoveNext()+0x2a3

`
problem is:
NpgsqlDataReader.Consume(bool async, Exception? firstException = null)

        while (!Connector.IsBroken)
        {
            try
            {
                if (!(_isSchemaOnly
                        ? await NextResultSchemaOnly(async, isConsuming: true).ConfigureAwait(false)
                        : await NextResult(async, isConsuming: true).ConfigureAwait(false)))
                {
                    break;
                }
            }
            catch (Exception e)
            {
                exceptions ??= [];
                exceptions.Add(e);
            }
        }

Its infinite loop collecting same exception,

any ideas how to fix?