[css-view-transitions-1] Setup view transition flushes update callback queue thrice?

[Psychpsyo]

Setup view transition, at the very end, says to

2. schedule the update callback for transition.
3. Flush the update callback queue.

Missing capitalization on "schedule" aside, scheduling the update callback will already flush the update callback queue in another task.
Is this intended?

[bramus]

This was changed in #11693 to fix #11292 which might shed some light on this.

A note in the spec to clarify why this extra “Flush the update callback queue” was added could be useful.