When typing in private chats ( I do not know if it happens in other chats ) if you type any message that started with < and after the "<" any letter. When this message is sent out, it turns into a blank.
For instance, sending these:
<a
<a0
<a*
It will turn into a blank when sent
However if you send these:
<1
<1a
<(a
<*1
It will turn out normal in the chat when sent.
Here's a video:
https://file.io/eislCoHfXuOl
Using chrome browser.