It seems that Gwenview has no plug for printing. I tried to connect it to cups, but the reaction was: 'snap “gwenview” has no plug named “cups” '. Is it really impossible to print from a snap version of Gwenview? That would be a very serious limitation!
Since it has neither cups nor cups-control, the answer is yes. You’d need to contact the developer to ask for printing support to be added, or consider rebuilding the snap or otherwise locally patching it, both of which would prevent automatic updates occuring.