[1.9.0] Gradle task forkedSpringBootRun fails with Could not resolve placeholder...

[dhladik]

After upgrading to 1.9.0, the spring boot app no longer starts, throwing this error:

Caused by: org.springframework.util.PlaceholderResolutionException: Could not resolve placeholder 'some.property' in value "${some.property}"

	at org.springframework.util.PlaceholderParser.replacePlaceholders(PlaceholderParser.java:128) ~[spring-core-6.2.1.jar:6.2.1]
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:118) ~[spring-core-6.2.1.jar:6.2.1]
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:114) ~[spring-core-6.2.1.jar:6.2.1]
	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:255) ~[spring-core-6.2.1.jar:6.2.1]
	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:226) ~[spring-core-6.2.1.jar:6.2.1]
	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:201) ~[spring-context-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:963) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1541) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1519) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:913) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:240) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1377) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:563) ~[spring-beans-6.2.1.jar:6.2.1]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:523) ~[spring-beans-6.2.1.jar:6.2.1]
	... 63 common frames omitted

Previous working version: 1.8.0
Spring Boot version: 3.4.1
Java version: 21

Gradle (Groovy) config:

openApi {
    outputDir.set(file("${swaggerDir}"))
    outputFileName.set("swagger.json")
    waitTimeInSeconds.set(120)
    customBootRun {
        workingDir.set(project.rootProject.projectDir)
    }
}