Theme Panel 12.4 – Can't expand any rows that control font settings

Hi Guys, I’m having a really strange issue with Theme Panel 12.4 following a recent upgrade.

Any of the rows within the themes panel that allow me to change fonts will not open, they create a 500 status in Google Search Console and the little square loading icon just sits spinning. All other settings work fine, I can expand and close all tabbed rows for anything other than font-related settings.

My server is a dedicated platform which is split in half into two virtual accounts and I have the same version of the theme running on another site on the same server on the other account using the same version of PHP which is working fine. The only difference between the two sites is the WordPress version, 6.1.1 on the working site, and 6.4.3 on the site with the issues.

I’ve raised the issues with hosting and they’re looking into it also.

Theme Panel Screengrab.

Google Chrome Console Screengrab.

Control Panel Screengrab

Google Console Screengrab