If you have Becubic Soft, or other rescaling quality in project settings and will add File Input node to the project - it will use the world default rescaling quality settings - you can change it by manualy editing nodes settings
But, if you will put File Input node inside of a group, that have another rescaling quality setting - file input node still use own settings, and will ignore settings of group. It will use only resolution of group - that is very bad if you have 999999999999 of them in project - because each of file input nodes now you need to change individualy - poop 