Any chance one of you encounter this issue since 12.0.23 upgrade, it happens on login page
Refused to apply style from 'https://xxxxx/auth/resources/nykwm/common/keycloak/web_modules/@fortawesome/fontawesome-free/css/icons/all.css' because its MIME type ('') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
A possible workaround in my case was to modify the docker image (the CSS file is not there, thus MIME type is an empty string):
RUN mkdir -p /opt/jboss/keycloak/themes/keycloak/common/resources/web_modules/@fortawesome/fontawesome-free/css/icons
RUN touch /opt/jboss/keycloak/themes/keycloak/common/resources/web_modules/@fortawesome/fontawesome-free/css/icons/all.css