@SpyBean can be stubbed, but @MockitoSpyBean cannot be stubbed

[JavaDevaraj]

In Spring Boot 3.3:

@SpyBean
private ReprocessBackOffImpl reprocessBackOffImpl;

doThrow(exception).when(reprocessBackOffImpl).assertPreConditions(context);

It's working fine....

but after upgrading to Spring Boot 3.4:

@MockitoSpyBean
private ReprocessBackOffImpl reprocessBackOffImpl;

doThrow(exception).when(reprocessBackOffImpl).assertPreConditions(context);

I'm getting the following exception.

Argument passed to when() is not a mock!
Example of correct stubbing:
    doThrow(new RuntimeException()).when(mock).someMethod();
org.mockito.exceptions.misusing.NotAMockException: 
Argument passed to when() is not a mock!