I'm pretty certain that this is a bug, only one mob at a time can go through Nether Portal. Even if multiple mobs went into the portal, only the first one who went in will be present in the Nether. It affected my guardian farm that uses many portals to send them into one location.
Is this a bug or intentional?
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Is it still affecting you? I can't seem to reproduce it on 1.16.50 / iOS. The attached test world "portal-one-mob-at-a-time.mcworld" has two levers, the left hand one spawns cows repeatedly, and the right hand one enables a water flow which pushes cows into a portal. The cows seem to be transported to the Nether without any problems.
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It seems to have fixed it in the latest beta version. Thanks for the response!