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No Live Migration after KB4487026 (also not after removing it again)

Hi, we’re running a 3-node Hyper-V cluster with Windows Server 2016 and a FibreChannel SAN. This morning I installed KB4487026 (and SSU KB4485447) on the first node. 

After the first reboot, the server crashed with BSOD USER_MODE_HEALTH_MONITOR. After resetting it again, server booted fine, had new build installed (14393.2791), and seemed to work. However, it can no longer receive live migrations. All VMs failed
their migration back. For each attempt, I get this event:

Log Name:      Microsoft-Windows-Hyper-V-High-Availability-Admin
Source:        Microsoft-Windows-Hyper-V-High-Availability
Date:          2/17/2019 11:15:26 AM
Event ID:      21123
Task Category: None
Level:         Error
Keywords:      
User:          SYSTEM
Computer:      <...>
Description:
Failed to set the migration networks at the VMMS: Unspecified error (0x80004005).
Event Xml:

  
    
    21123
    0
    2
    0
    0
    0x8000000000000000
    
    10098
    
    
    Microsoft-Windows-Hyper-V-High-Availability-Admin
    <...>
    
  
  
    
      %%2147500037
      0x80004005
    
  

KB4487026 describes a known issue with SCVMM that seems related:

For hosts managed by System Center Virtual Machine Manager (SCVMM), SCVMM cannot enumerate and manage 
logical switches deployed on the host after installing the update.

I cannot perform the suggested workaround (compile two MOF files) because these MOF files are specific to SCVMM and do not exist on our servers.

Still I concluded that the issue must be related to the update and uninstalled it. That did not help though - even after removing KB4487026, Live Migration is still not possible.

I quick-migrated some VMs to the node for now. Does anyone have the same issue, or an idea?

(Live migrations from the updated node to the other nodes or between the other nodes, as well as quick migrations between all nodes, are working fine.)

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