Describe the bug
When starting chatterino now almost all tabs are highlighted.
To reproduce
Start chatterino :upside_down_face: .
Screenshots

Chatterino version
Chatterino 2.2.3-beta (commit 7d2b64087)
Operating system
Arch Linux latest
Additional information
Interesting: this problem does not occur when building Chatterino in debug mode.
Actually this doesn't even have anything to do with historical messages. I have a tab without any historical messages and that one lit up...
I believe it is related to the connected system message posted when you join a channel. The message flags do not seem to be applied (or parsed?) correctly in release mode.
I ran git bisect and nailed it down to 4199a01b96a222d72db98017c6599e858d9ef472 which is the commit that merged in #1748.
Edit: More specifically, it was probably introduced through this diff.
This also seems to apply to hosting messages.