For any android reading that:

The idea is not to "Don't apply team bonuses to defeated players".
I guess it's to
"Don't apply auras affecting a player entity to defeated players (by team bonus or not)".
For those interested in unit tests, it's interesting to point out what catch that (as I guess it's not OnGlobalPlayerDefeated).

(To be more explicit, it doesn't solve the issue it aimed to solve)

In rP21713#30160, @fatherbushido wrote:

(To be more explicit, it doesn't solve the issue it aimed to solve)

You mean because D1430 still exists?

Unit tests:

Test 1
aura source =player entity (player 1)
aura target = player entity (player 2)
aura diplomacy type = ally
player 1 and 2 are allies

After defeat of player 2, GetAffectedPlayers still returns [1]

--> OK

Test 2
aura source = not a player entity (owned by player 1)
aura target = player entity (player 2)
aura diplomacy type = ally
player 1 and 2 are allies

After defeat of player 2, GetAffectedPlayers still returns [1,2]

--> Not OK

Code:

Affected players are calculated on init and on clean.
Clean is called by OnGlobalPlayerDefeated when the aura source is a player. (The global listening was perhaps not needed in rP21712)
So test1 pass and test2 fails.

Something like what is below could do it:

if (!Engine.QueryInterface(this.entity, IID_Player))
-> if (!Engine.QueryInterface(this.entity, IID_Player) || !HasPlayerAura ())

(where HasPlayerAura() is to add)

If one want to see it, wonder aura should show that or better giving the ptolemian team bonus aura to a cc for example. (though I don't exactly know what the state of those things is).
Left to the reader as my 6min eggs are probably hard boiled now.

I hope the eggs still came out palatable.

The global listening was perhaps not needed in rP21712

The global subscribtion is needed so that team bonuses of non-defeated players are cleaned too, no?

Test 2

I couldnt reproduce an issue. Unit and structure entity auras affecting player entities are still cleaned on defeat in the onOwnershipChange clean call, no?
I tried by giving the ptolemian bonus aura to CCs as you proposed, using

Index: binaries/data/mods/public/simulation/templates/template_structure_civic_civil_centre.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_structure_civic_civil_centre.xml	(revision 21730)
+++ binaries/data/mods/public/simulation/templates/template_structure_civic_civil_centre.xml	(working copy)
@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_structure_civic">
+  <Auras datatype="tokens">
+    teambonuses/ptol_player_teambonus
+  </Auras>
   <AlertRaiser>
     <List datatype="tokens">FemaleCitizen</List>
     <RaiseAlertRange>140</RaiseAlertRange>

When starting the game we can see the food count increasing if and only if there is an ally with a CC.
When typing "exodia 2" the ally is defeated and the trickle stops.

Edit: Nevermind, got it. The defeated player still receives the trickle because the CC of the non-defeated player wasn't cleaned.

The global listening was perhaps not needed in rP21712

not needed in rP21712, but needed in that one.