Profile doesn't work on application.properties file but on equivalent yaml file

Describe the bug I have a configmap with a application.properties file which has some custom values. It also makes use of different profiles. However, the value in the active profile is not read by the application. Switching to equivalent application.yml file works.

Sample The original configmap with application.properties is as follows (truncated for brevity):

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  application.properties: |-
    ....
    ---
    spring.profiles: staging
    verification.url.format: https://api.dev.url.com/verification?email=%s&token=%s
    ---
    spring.profiles: prod
    verification.url.format: https://api.url.com/verification?email=%s&token=%s

When I try to read verification.url.format in the staging profile, it gives me the string in prod profile. However, switching to the following configmap works:

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  application.yml: |-
    ....
    ---
    spring:
      profiles: staging
    verification:
      url:
        format: https://api.dev.url.com/verification?email=%s&token=%s
    ---
    spring:
      profiles: prod
    verification:
      url:
        format: https://api.url.com/verification?email=%s&token=%s

Environment:

• Spring Boot 2.3.1.REALEASE
• Spring Cloud Kubernetes: 1.1.4.RELEASE

[spencergibb]

properties files won’t support mutltiple inline documents until boot 2.4.x

[l0rem1psum]

• Spring Boot 2.3.1.REALEASE
• Spring Cloud Kubernetes: 1.1.4.RELEASE