Bug: Icons not showing correctly after opening devtools

[djschilling]

Bug description

In general using the Font-Awesome icons works. But if i reload my side, then open the devtools and then reload my side again the icons show random utf8 symbols. After another reload the icons work again:

Reproducible test case

https://review.church.tools/

Font Awesome version

v6.4.0

Serving

Self-hosted

Implementation

CSS

Browser and Operating System

• Chrome 112.0.5615.137 on MacOs

Web bug report checklist

• I have included a test case because my odds go way up that the team can fix this when I do
• I have searched for existing issues and to the best of my knowledge this is not a duplicate

[tagliala]

Self-hosted

I suspect this may be related to #17644

Please try by hosting on the CDN

This should be a the best fix (nginx level): #17644 (comment)

I can confirm from:

1. 
2. Charset is missing from CSS (but this will not fix 100% of the cases)
3. Charset is missing from response headers of index-19625735.css