I'd suggest you take a look at OWASP guide relating to XSS, PHP and JS.
A quick answer would be : If you have a doubt then yes there's a risk because you haven't did enough testing / understand the underlying process so you could convince yourself it's safe.
Not to be rude but if your last line of defense against XSS is
having your code validated by a mailing list then maybe you should
go to a safer way...
You could also run ZAP thru your test server and see what comes back.
Here's some link
OWASP Cheatsheet
https://owasp.org/www-project-cheat-sheets/
OWASP Application Security Verification Standard (XSS/SQL
Injection/Remote code execution, etc)
https://owasp.org/www-project-application-security-verification-standard/
OWASP Web Security Testing Guide
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