Seconds with the levitation effect caused by being hit by the Shulker mob, will cause your client to disconnect with the error:

"Internal Exception: io.netty.handler.codec.DecoderException: com.google.gson.JsonSyntaxException:com.google.gson.stream.Malformed.JsonException: Use JsonReader..setLenient(true) to accept malformed JSON at line 1 column 2"