Connecting from awsiotsdk to Greengrass Core over LocalMQTT TLS problems

I try and connect from a client device over localMQTT to the broker on the greengrass core. However, when I connect, I get this error on the awsiotsdk side. I ran an almost identical script to this a couple months ago and I don't think it had the same problems.

Traceback (most recent call last):
  File "client_v2.py", line 76, in <module>
    connect_future.result()
  File "/Users/username/.pyenv/versions/3.8.11/lib/python3.8/concurrent/futures/_base.py", line 444, in result
    return self.__get_result()
  File "/Users/username/.pyenv/versions/3.8.11/lib/python3.8/concurrent/futures/_base.py", line 389, in __get_result
    raise self._exception
awscrt.exceptions.AwsCrtError: AWS_IO_TLS_ERROR_NEGOTIATION_FAILURE: TLS (SSL) negotiation failed

On the Core side, I have just the Moquette broker and the bridge and a component that subscribes to the messages coming off of LocalMqtt and through the bridge. This is the message in greengrass.log

2022-04-05T07:00:56.397Z [ERROR] (nioEventLoopGroup-7-10) io.moquette.broker.NewNettyMQTTHandler: Unexpected exception while processing MQTT message. Closing Netty channel. CId=null. {}
io.netty.handler.codec.DecoderException: javax.net.ssl.SSLProtocolException: Received close_notify during handshake
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:478)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at io.moquette.broker.metrics.BytesMetricsHandler.channelRead(BytesMetricsHandler.java:51)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: javax.net.ssl.SSLProtocolException: Received close_notify during handshake
        at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:129)
        at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:117)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:339)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:295)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:286)
        at java.base/sun.security.ssl.Alert$AlertConsumer.consume(Alert.java:250)
        at java.base/sun.security.ssl.TransportContext.dispatch(TransportContext.java:185)
        at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:172)
        at java.base/sun.security.ssl.SSLEngineImpl.decode(SSLEngineImpl.java:681)
        at java.base/sun.security.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.java:636)
        at java.base/sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:454)
        at java.base/sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:433)
        at java.base/javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:637)
        at io.netty.handler.ssl.SslHandler$SslEngineType$3.unwrap(SslHandler.java:282)
        at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1387)
        at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1282)
        at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1329)
        at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:508)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:447)
        ... 25 more

2022-04-05T07:00:56.399Z [INFO] (nioEventLoopGroup-7-10) io.moquette.broker.metrics.MQTTMessageLogger: Channel Inactive. {}

I'm using the mqtt_connection_builder.mtls_from_path function to create my connection setup between the client and the core, but obviously during the connect function itself it breaks because of the TLS handshake.