Two categories of issue were identified in InternalStreamConnection:

1. No connection close on responseTo mismatch detection

getCommandResult() detects the mismatch and throws MongoInternalException, but callers in both the sync (sendAndReceive) and async (sendCommandMessageAsync) paths did not catch
MongoInternalException separately — it fell through to the generic Exception handler which does not close the connection. The corrupted connection was returned to the pool and reused.

2. catch(Exception) misses Error subclasses in async paths

Three locations caught Exception instead of Throwable, meaning an OutOfMemoryError (or any Error) during async I/O would bypass the close() call:

• readAsync() — catch (Exception e) did not catch Error
• sendMessageAsync() — thenRunTryCatchAsyncBlocks was parameterized with Exception.class instead of Throwable.class
• MessageHeaderCallback.onResult() — caught Throwable but did not call close() before invoking the callback