/auth/realms/PolarBookshop is invalid with Keycloak - Version 22.0.3

[donniexyz]

Using services.keycloak.image: quay.io/keycloak/keycloak:latest
which based on /opt/keycloak/version.txt it is actually Keycloak - Version 22.0.3.

I was unable to start edge-service with property:
spring.security.oauth2.client.provider.keycloak.issuer-uri: ${KEYCLOAK_URL:http://localhost:8080}/auth/realms/PolarBookshop
showing error message:
Caused by: java.lang.IllegalArgumentException: Unable to resolve Configuration with the provided Issuer of "http://localhost:8080/auth/realms/PolarBookshop"

After change it to http://localhost:8080/realms/PolarBookshop, then it can work as normal.