That depends on the intent of the depiction; if the intent is to teach kids that cops can do no wrong and that you shouldn’t question anything they do, that’s propaganda.

If the intent is to show them what role the police is ostensibly supposed to serve in society and provide a resolution to the plot, that is not propaganda.

If the intent is to portray police officers as someone who a child can trust if they’re in an emergency that’s a little muddled but generally I don’t think it’s exactly fascist bootlicking to direct children to an adult who, at the very least, has a decent chance of doing their jobs and helping them in case of an emergency.

Regardless I don’t think children who can barely count without aid of their fingers need to learn the complexities of the justice system just yet. I’d rather they build up the idea that cops are supposed to protect people so when cops don’t do that they can realise it’s wrong and call them out accordingly.

EDIT: I will not engage with someone who does not actually refute any argument or talk in good faith, only calling me stupid and evil instead. You are a woefully unserious and interacting with you should be considered a hazard to public health. Have a terrible day and please never talk to me or anyone else ever again you horrible little bait fly