spring-cloud-vault-config-databases with Spring Boot 2.4.0 Config Data API fails to bind properties

Question

I'm using spring-cloud-vault-config-databases with Spring Boot 2.4.0 Config Data API as the prefered mode described here bootstrap.yml configuration not processed anymore with Spring Cloud 2020.0 :

1. When I'm using Spring Boot 2.4.0 Config Data API to import configuration from Vault (Preferred) the secret properties are not binded to the spring.datasource.username & spring.datasource.password and my postgres cnx fails.

2. When I'm using "Legacy Processing" with the bootstrap configuration property spring.cloud.bootstrap.enabled=true the properties spring.datasource.username & spring.datasource.password are well binded to my Vault secret.

What is the expected behaviour of the spring-cloud-vault-config-databases ? Is expected to works with Spring Boot 2.4.0 Config Data API ?

my application.yml

spring.cloud.vault:
  enabled: true
  authentication: CERT
  ssl:
    key-store: file: ...
    key-store-password: ...
    trust-store: ...
    trust-store: ...
    trust-store-password: ...
    cert-auth-path: ...
  uri: https:...
  namespace: ...
  fail-fast: true

  database:
    enabled: true
    role: myPostgresRole
    backend: database/postgres/...
    username-property: spring.datasource.username
    password-property: spring.datasource.password    

spring:
  config:
    import: vault://secret/... , vault://database/postgres/...

Versions used :

spring-boot : 2.4.11

spring-cloud : 2020.0.3

spring-cloud-vault-config-databases : 3.0.3