Hello Ciaran,
I have a little issue with the J4 Nina template.
I got 404 errors because of the jarallax.im.js.map is missing.
Referring to this post https://www.joomla51.com/forum/jasmine-template you have given the advice to remove the last line that references to this file but would it be better to add this file to the template? (It can be downloaded on https://cdnjs.com/libraries/jarallax)
Maybe it can be a future request to add a possibility to disable the module background parallax effect by disabling it on the "General/Miscellaneous" options like
"Diasable Parallax effects for module backgrounds"?
I also have an issue with a Layla installation (1.1.5) in which this error occurs:
GEThttps://as-s3c.de/media/templates/media/vendor/joomla-custom-elements/css/joomla-alert.css
which throws an 404 error.
In my installations there is no "/media" folder under /media/templates (only administrator and site) so it might be not a problem of your template but of Joomla itself?
I am not quite sure.
In my case I added the path and the missing joomla-alert.css file so the error is solved but that is only a temporary solution.
Maybe you have an idea to add this to the templates?
Regards
Oliver