YAML: Spring Boot Escape sequence not working

When using a yaml with the spring boot escape sequence of "[key.with.dots]" the conversion will not work and an invalid key exception will be thrown. The Environment Controller expects in between the "[]" a digit index.

Im using spring-cloud-config-server version 2.2.2.RELEASE.

For example this yaml:

webservices:
    "[domain.test:8080]":
        -   username: me
            password: mypassword

throws

java.lang.IllegalArgumentException: Invalid key: webservices[domain.test:8080][0].password
	at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.getIndex(EnvironmentController.java:457)
	at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.setListValue(EnvironmentController.java:418)
	at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.setMapValue(EnvironmentController.java:409)
	at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.access$100(EnvironmentController.java:366)
	at org.springframework.cloud.config.server.environment.EnvironmentController.convertToMap(EnvironmentController.java:256)
	at org.springframework.cloud.config.server.environment.EnvironmentController.labelledYaml(EnvironmentController.java:219)
	at org.springframework.cloud.config.server.environment.EnvironmentController.yaml(EnvironmentController.java:208)