I have never observed this, except with anti flood protection in the client or server I was using to send.
Quite often in testing and fighting spam bots I’ve lost because I got globalled from Chat for flooding chat.
You really shouldn’t “see” this unless you are broken or deliberately trying to break rate limits. Sounds like an issue with your TCP sending stack, orother factors rather than Twitch itself.
Since the stack of messages getting dropped on a violation, means must be in a queue yourside rather than Twitch Side.