[Bug]: NullPointerException from ResourceReaper in GenericContainer.stop

Module

Core

Testcontainers version

2.0.3

Using the latest Testcontainers version?

Yes

Host OS

Linux

Host Arch

x86

Docker version

GitHub hosted runners

What happened?

java.lang.NullPointerException: Cannot invoke "Object.hashCode()" because "key" is null
	at java.base/java.util.concurrent.ConcurrentHashMap.replaceNode(ConcurrentHashMap.java:1125)
	at java.base/java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1116)
	at org.testcontainers.utility.ResourceReaper.stopAndRemoveContainer(ResourceReaper.java:175)
	at org.testcontainers.containers.GenericContainer.stop(GenericContainer.java:652)
	at io.trino.tests.product.launcher.env.DockerContainer.reset(DockerContainer.java:411)
	at io.trino.tests.product.launcher.env.Environment.tryStart(Environment.java:157)

Exact repro steps are unclear.
Based on exceptions logged earlier in the CI run (https://github.com/trinodb/trino/actions/runs/22016571723/job/63619535768?pr=28120) this may be after a failed startup attempt.

Relevant log output

Additional Information

https://github.com/trinodb/trino/actions/runs/22016571723/job/63619535768?pr=28120

Start with ResourceReaper.java at line 175 and GenericContainer.java at line 652, then compare the failed-startup exceptions in the linked Trino CI run. Reproduce the cleanup path after a failed startup and add coverage showing that GenericContainer.stop completes without this NullPointerException.