Spring Cloud Bootstrap not properly decrypting ENV

[mdlck]

Describe the bug Spring Cloud Bootstrap is not properly decryping an environment variable if it is written with _ (as it should be) instead of . (not recommended). During runtime it then appears to be still encrypted and with the {cipher}-prefix.

For example: If i have an environment variable named CONFIGPROPS_VAR2ENCRYPTED and Autowire a related @ConfigurationProperties-Bean -> it's still encrypted :( If i have an environment variable named CONFIGPROPS.VAR3ENCRYPTED and Autowire a related @ConfigurationProperties-Bean -> it's decrypted :o

Sample I made a minimum sample project that shows this bug: https://github.com/mdlck/spring-cloud-bug Just start the JUnit-Test with the ENV-Variables from the README.md. From my point of view, it should not fail, but it does. :/

Spring Boot Version: 2.7.6 Spring Cloud Version: 2021.0.5