Acronis Backup 12.5: Quiesced snapshot creation fails for Windows Server 2019 VMs on ESXi 6.5 or 6.7

Symptoms

1. You are backing up a virtual machine with Windows Server 2019 on ESXi 6.5 or 6.7 using Agent for VMware (Windows) or Virtual Appliance,
2. Agentless backup finishes with warning

Creating a crash-consistent snapshot of virtual machine because the creation of its application-consistent snapshot has failed. An error occurred while saving the snapshot: Failed to quiesce the virtual machine