For AVIF files, how do you resize them on the fly? For JPEGs, we add a URL parameter, for example: fit=clip&w=100 to the end of the image file and it just resizes. However, if we add that to the AVIF files, nothing happens. Also, in the API explorer, the responsiveImage URL is always blank for AVIF, though it works perfectly fine for JPEG. Can you not resize AVIF files?
Could you send us over the asset link and the project link it is in to us at firstname.lastname@example.org together with the parameters you are using?
Unfortunately the AVIF format is not valid as input in Imgix:
Meaning that it will ignore the parameters, as you rightly figured out.