Zach Snyder's Cut of Justice League is listed as a separate film

@Peter_pbn

I guess that shows how poor the search is in sprinklr. I looked for it because I thought it had been discussed.

That's a poor answer. It means there is no standard way. Its just whatever IMDb feels like. There are many movies with significantly different cuts that are all considered alternate versions of the original. This is no different. It should be an alternate version, not a separate listing.

I know this will be an unpopular opinion but those 2 hours of footage are all just filler. It's the stuff that should be cut away before release.

There are other examples. The longest version of Return of the King is over an hour longer than the already massive 201 minute running time of the theatrical release. Until the End of the World was originally released at 158 minutes but there is a 287 minute directors cut (which is more footage than Justice league). These are all still considered a single movie. I think Justice League should be considered one too (and I wonder how much this is just giving the fanboys what they want by having it as a separate movie.)

Well, it sounds as though one movie contains the other but without being a sequel to that other, so I'm not sure if it counts. Also, one is not a shot-for-shot complete alternate of the other.

those 2 hours of footage are all just filler

That may be, but it still makes for a very different viewing experience. That for me is a very important issue in considering whether or not a new version of a title should have its own page.