Authorization does not respect spring boot properties spring.data.mongodb.authentication-database

[sunny-chung]

I am using org.springframework.boot:spring-boot-starter-data-mongodb:3.1.0 with reactive repositories and MongoDB 6.0.6.

When below application.yml is supplied to Spring Boot:

spring:
  data:
    mongodb:
      host: mongo:27017
      username: username
      password: password
      authentication-database: admin
      database: other

Spring Data MongoDB always connects to "other" database for authorization when a query is performed, while expected behaviour is to connect to "admin" as configured above. The configuration spring.data.mongodb.authentication-database is ignored. This issue can also be observed in Spring Data MongoDB logging.

Exception Log:

org.springframework.data.mongodb.UncategorizedMongoDbException: Exception authenticating MongoCredential{mechanism=SCRAM-SHA-256, userName='username', source='other', password=<hidden>, mechanismProperties=<hidden>}
        at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:140) ~[spring-data-mongodb-4.1.0.jar!/:4.1.0]
        Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
...

[mp911de]

This is a Spring Boot issue. It seems to be a duplicate of spring-projects/spring-boot#35566. Can you verify this? If it is not a duplicate, please file a ticket against Spring Boot.