If a minecart with spawner is summoned, no mob is inside the spawner.
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Just /summon spawner_minecart

I was unable to reproduce it spawned pigs right when it was summoned. Can you provide a screenshot with your debug screen enabled?

So the minecart still spawns mobs, but there's no mob in the cage.
At first, I spawned it, but there's no spawning platform so I thought it didn't work at all.

Can confirm that the spawner minecart has no mob inside of it, but does spawn pigs.

Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-65065, which is a report that has not been resolved yet.
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What command did you use to spawn it in?