Windows Server 2012-R2 or 2016 Failover cluster manager: multiple online resources

I was wondering if anybody experienced and/or resolved the following issue:

Windows Failover cluster Setup:

• Two Windows 2016 or 2012-R2 server nodes: A and B with current Windows patches.
• Generic Application DLL resource: implements IsAlive(), LookAlive(), Online() and Offline()
• Virtual IP address resource: as a dependency of the Generic Application
• Policy: configured to failover at the first failure
  1. Period for Restarts=15:00
  2. Maximum restarts in the specified period=0
  3. Delay between restarts=0

Issue:

When IsAlive() fails on A primary server, the cluster manager:

• Does not call Offline() on A (leaving A online)
• Moves VIP address from A to B
• Calls Online() on B

As a result, both A and B Application resources are online.