Zone Affinity not working

Describe the bug
Zone affinity works in the same zone but when it doesn't refer to another zone when first instance is down.

 <java.version>11</java.version>
  <spring-cloud.version>2021.0.5</spring-cloud.version>
  <spring.boot.version>2.7.6</spring.boot.version>

bootstrap.yml
eureka:
  client:
    region: default
    registryFetchIntervalSeconds: 60
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://******:*****!@localhost:14973/eureka
  instance:
    healthCheckUrl: http://localhost:14974/actuator/health
    homePageUrl: http://localhost:14974/
    hostname: localhost
    nonSecurePortEnabled: true
    securePortEnabled: false
    statusPageUrl: http://localhost:14974/actuator/info

It used to work with other services with older version of spring cloud and java but since we have migrated, this is the issue we are able to see

Start with the bootstrap.yml configuration and the reported Java 11, Spring Boot 2.7.6, and Spring Cloud 2021.0.5 versions. Reproduce the zone-affinity behavior while the first instance is down, then compare it with the older working service versions mentioned in the report. Done means requests fail over to an instance in another zone as expected.