That version what you try is "development", means it maybe not work or have bugs.
You should use "stable" version.
Another thing, 19.02.2022 has been update to game:
https://steamcommunity.com/games/zps...41368793049535
Maybe something got broken, I don't know.
I don't have now OS Linux for testing purpose.
*edit
Seems game is using own addon this on... and have even own admin system.
Quote:
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Welcome to the Zombie Panic! Source Angelscript API documentation!
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https://api.zombiepanicsource.com/#home