Alt-Svc HTTP/3 header

Alt-Svc: 'h3=":443"; ma=864000';

The above header announces that the web server supports HTTP/3 on port 443 (UDP).

However, when inserting the above header, or variations of it in the Custom HTTP headers field, found under Advanced Policies, the result is catastrophic website failure that I’ve only been able to resolve with a website database restoration, or manually deleting NinjaFirewall’s options from the database (via delete_option()).

I tested with a HTTP/2 version of this header, which didn’t result in catastrophic website failure, but the header is not correctly saved. For example
Alt-Svc: 'h2=":443";
becomes
Alt-Svc: 'h2="

These would suggest there is an issue with how the full-colon is being received by NinjaFirewall.