Transition got different behavior in dev & prod mode

[CaiWenlie]

Vue version

3.5.12

Link to minimal reproduction

https://play.vuejs.org/#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

Steps to reproduce

occurs when there is a class on Transition tag and there is a KeepAlive at the same time.
in dev mode, everything is ok. but when switch to prod mode, the toggle will not work.

What is expected?

dev & prod should have consistent behavior

What is actually happening?

transition not work in prod mode

System Info

No response

Any additional comments?

No response

[Robind-ev]

We have the same issue, during development our subnavigation transition with keep alive would work, in production builds it only show the first item.

After removing the keep alive, it works better, but there still is a difference, where the transition out-in would only play the out animation in production, snapping the new component without a transition. In development this is not the case.