Validation on nested configuration not working

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From https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/Using.20.40ConfigProperties.20with.20validation/near/226199040

quarkus-config-sample.zip

Describe the bug
According to https://quarkus.io/guides/config-reference#additional-notes-on-configproperties I should be able to validate nested configuration but it doesn't seem to work, regardless if I use private members with getters/setters, public fields, or interfaces.

Expected behavior
I would expect the application to fail when starting up and saying

ERROR [io.qua.run.Application] (Quarkus Main Thread) Failed to start application (with profile dev): javax.validation.ConstraintViolationException: prizeAmount: must be greater than 0
	at io.quarkus.arc.runtime.config.ConfigPropertiesProducer.produceGreetingConfiguration(ConfigPropertiesProducer.zig:198)

Actual behavior
The application starts up without error

To Reproduce
Reproducer application attached.

Configuration

greeting.message=hello
greeting.name=quarkus
greeting.content.prize-amount=0
greeting.content.recipients=Jane,John

quarkus-config-sample.zip

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quarkusio#15081

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$upstream:15081$