ServiceReference#getUsingBundles() returns usages with 0 count

Javadoc for ServiceReference#getUsingBundles() states

Specifically, this method returns the bundles whose usage count for that service is greater than zero.

However, the implementation uses ServiceRegistry#getUsingBundles(ServiceReference<?> ref), which returns usages even if usage count is 0.

The usage count is 0, because ServiceRegistry#ungetService doesn't call ServiceRegistry#flushUsageCount for non-prototype services:

// If the registration is invalid or the usage count for a prototype
// reached zero, then flush it. Non-prototype services are not flushed
// on ungetService() when they reach 0 as this introduces a race
// condition of concurrently the same service is obtained via getService()

Expected:

ServiceReference#getUsingBundles() doesn't return usages with 0 count