Which @angular/* package(s) are the source of the bug?

animations

Is this a regression?

No

Description

When there is a :leave animation the parent propagates to the event to the children so that they can also animate their :leave transitions, this works as expected whilst using the emulated view encapsulation, but with shadow dom this doesn't actually happen

As you can see here:

Please provide a link to a minimal reproduction of the bug

stackblitz reproduction

Anything else?

• I actually discovered this whilst looking into Style binding + style animation + non-reused route + emulated encapsulation breaks route transition animation #46360, this explains why in that issue there are inconsistent behaviors between emulated and shadow dom (but the resolution of this issue does resolve the other one, it only makes the emulated and shadow behaviors the same)

• I have identified where the bug lies (around the _signalRemovalForInnerTriggers function) and I've already implemented a solution (which is pretty straightforward really), I just need to double check it and add unit tests for it, I'll open a PR likely tomorrow or in the next few days anyways 🙂 (I just figured I could open this issue to clarify the bug)