Flaky test: "must handle all events exactlyOnce"

```
[info] - must handle all events exactlyOnce *** FAILED *** (53 seconds, 598 milliseconds)
[info] java.lang.AssertionError: Timeout (30 seconds) during receiveMessage while waiting for message.
[info] at org.apache.pekko.actor.testkit.typed.internal.TestProbeImpl.$anonfun$receiveMessage_internal$1(TestProbeImpl.scala:410)
[info] at scala.Option.getOrElse(Option.scala:201)
[info] at org.apache.pekko.actor.testkit.typed.internal.TestProbeImpl.receiveMessage_internal(TestProbeImpl.scala:193)
[info] at org.apache.pekko.actor.testkit.typed.internal.TestProbeImpl.receiveMessage(TestProbeImpl.scala:190)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.$anonfun$new$7(EventSourcedChaosSpec.scala:204)
[info] at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:192)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.$anonfun$new$15(EventSourcedChaosSpec.scala:201)
[info] at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:192)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.$anonfun$new$2(EventSourcedChaosSpec.scala:239)
[info] at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
[info] at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[info] at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
[info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[info] at org.scalatest.Transformer.apply(Transformer.scala:22)
[info] at org.scalatest.Transformer.apply(Transformer.scala:20)
[info] at org.scalatest.wordspec.AnyWordSpecLike$$anon$3.apply(AnyWordSpecLike.scala:1240)
[info] at org.apache.pekko.actor.testkit.typed.scaladsl.LogCapturing.withFixture(LogCapturing.scala:79)
[info] at org.apache.pekko.actor.testkit.typed.scaladsl.LogCapturing.withFixture$(LogCapturing.scala:77)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.withFixture(EventSourcedChaosSpec.scala:105)
[info] at org.scalatest.wordspec.AnyWordSpecLike.invokeWithFixture$1(AnyWordSpecLike.scala:1238)
[info] at org.scalatest.wordspec.AnyWordSpecLike.$anonfun$runTest$1(AnyWordSpecLike.scala:1250)
[info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
[info] at org.scalatest.wordspec.AnyWordSpecLike.runTest(AnyWordSpecLike.scala:1250)
[info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$(AnyWordSpecLike.scala:1232)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.runTest(EventSourcedChaosSpec.scala:105)
[info] at org.scalatest.wordspec.AnyWordSpecLike.$anonfun$runTests$1(AnyWordSpecLike.scala:1309)
[info] at org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:413)
[info] at scala.collection.immutable.List.foreach(List.scala:334)
[info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
[info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:390)
[info] at org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:427)
[info] at scala.collection.immutable.List.foreach(List.scala:334)
[info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
[info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:396)
[info] at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:475)
[info] at org.scalatest.wordspec.AnyWordSpecLike.runTests(AnyWordSpecLike.scala:1309)
[info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$(AnyWordSpecLike.scala:1308)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.runTests(EventSourcedChaosSpec.scala:105)
[info] at org.scalatest.Suite.run(Suite.scala:1114)
[info] at org.scalatest.Suite.run$(Suite.scala:1096)
[info] at org.apache.pekko.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit.org$scalatest$BeforeAndAfterAll$$super$run(ScalaTestWithActorTestKit.scala:41)
[info] at org.scalatest.BeforeAndAfterAll.liftedTree1$1(BeforeAndAfterAll.scala:213)
[info] at org.scalatest.BeforeAndAfterAll.run(BeforeAndAfterAll.scala:210)
[info] at org.scalatest.BeforeAndAfterAll.run$(BeforeAndAfterAll.scala:208)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.org$scalatest$wordspec$AnyWordSpecLike$$super$run(EventSourcedChaosSpec.scala:105)
[info] at org.scalatest.wordspec.AnyWordSpecLike.$anonfun$run$1(AnyWordSpecLike.scala:1354)
[info] at org.scalatest.SuperEngine.runImpl(Engine.scala:535)
[info] at org.scalatest.wordspec.AnyWordSpecLike.run(AnyWordSpecLike.scala:1354)
[info] at org.scalatest.wordspec.AnyWordSpecLike.run$(AnyWordSpecLike.scala:1352)
[info] at org.apache.pekko.projection.r2dbc.EventSourcedChaosSpec.run(EventSourcedChaosSpec.scala:105)
[info] at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:321)
[info] at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:517)
[info] at sbt.ForkMain$Run.lambda$runTest$1(ForkMain.java:414)
[info] at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[info] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[info] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[info] at java.lang.Thread.run(Thread.java:750)
[info] + Iteration #1. Processed [240] events in [2] projections from [44] pids.
```

Start with EventSourcedChaosSpec.scala, especially the event loop around lines 201 and 204 and the enclosing test at line 239. Run the failing "must handle all events exactlyOnce" test repeatedly and inspect the timeout while waiting for messages. Done means the test reliably processes all 240 events across the two projections without timing out.

Written by the indexing model from the issue text.