Template components not automatically referencing their CSS. My fault, please assist.

[Jonathan Solomon]

Maybe I messed up an upgrade, but template components aren't referencing their own CSS.

I had to add the following line to the component "listing-details-gallery.tpl" to get it working:
flUtil.loadStyle(rlConfig.tpl_base + 'components/listing-details-gallery/listing-details-gallery.css');


Do you have ideas/suggestions for what could be wrong in my server setup or my upgrade process that I needed to add that line?
Thank you!

(running: 4.9.2, on php-7.4.33)