[Bug] Maven up the stakes not working in specific scenario

Debug Reference number: 2,358,269,269
Ran a T14 Beach occupied by the Purifier and have the Atlas passive Destructive Play activated. No scarabs, Maven witness active.

Steps to reproduce:
1. Clear the entire map of monsters except for the boss.
2. Enter the map boss area. During the animation of the Elder sucking the map boss into the portal, spawn a hideout portal and step into it.
3. Complete a trade, then re-enter the map.
4. Let the Elder animation complete, then step through the boss portal and kill the Purifier (I have a high dps build and killed the boss very quickly).

Observe that Maven does not Up the Stakes during the final boss phase (or after the death of the boss as I typically see).

Expected results:
Maven will call out "It's time to up the stakes!" and spawn additional bosses, even if the map boss is already dead.

Update:
Happened again in another map when I killed the boss very near instantly. Also Beach T14, this time occupied by the Enslaver. I did not portal back to the hideout this time, so we can probably eliminate that from the repro.

Also of note - Maven continued to 'harass' the player after the death of the Enslaver.
Debug reference number: 2,016,339,938

And just for sanity, I double checked my Atlas passives, ran one map in between this and the other bug repro and successfully got the Up the Stakes to work. Maybe specific to the Beach?

Update: Also repro in Coves T14 - occupied by Purifier
Debug reference number: 1,048,631,751

I cleared all but 22 monsters before killing the boss.

So not 100% repro: Just did another T14 beach with Eradicator and did get an Up the Stakes. The main difference I can see is that the first phase the boss did his break apart into static balls thing so the boss fight took significantly longer than normal (where I phase or kill the boss usually in less than 1 second).

Has been this way since Destructive Play was added. They patched it in 3.23 to stop it, but instead it's just a chance to get no extra bosses. It still happened enough times that I will just wait for her to say the line before attacking if the build I'm playing can burst the boss down.

Has been reported several times since 3.23. Just wait for the line or accept randomly getting no extra bosses until they fix it.