We usually release updates to correct bugs or compatibility issues. We are not aware of any incompatibilities with PHP 8.
Have you encountered any issues with using the current theme version with PHP 8?
Disable the caching functionality and re-check if the issue is still present.
If it’s resolved, re-enable caching but look for a minify option in the caching plugin and leave that disabled as it can interfere with the order the theme’s styles are applied.