Unreal process does not quit when exiting the editor in 4.27. OVRPlugin related?

We updated to UE 4.27 and now, frequently, the editor process does not actually end when we close the editor.  We have to go into the Task Manager to kill it.  In the debugger, the call stack looks like it is in the OVR Plugin.  Anyone know what this could be?

ntdll.dll!00007ffe907ccfc4() Unknown
KernelBase.dll!00007ffe8e321ace() Unknown
nvwgf2umx.dll!00007ffe5c716836() Unknown
nvwgf2umx.dll!00007ffe5c717930() Unknown
nvwgf2umx.dll!00007ffe5c717f79() Unknown
nvwgf2umx.dll!00007ffe5c7a74bc() Unknown
d3d11.dll!00007ffe88ddaea7() Unknown
d3d11.dll!00007ffe88ddadb6() Unknown
d3d11.dll!00007ffe88ebea57() Unknown
LibOVRRT64_1.dll!00007ffdb3c50f13() Unknown
LibOVRRT64_1.dll!00007ffdb3ba3434() Unknown
LibOVRRT64_1.dll!00007ffdb3bb5931() Unknown
OVRPlugin.dll!00007ffdb870cb90() Unknown
OVRPlugin.dll!00007ffdb8712be7() Unknown
OVRPlugin.dll!00007ffdb8705c53() Unknown
OVRPlugin.dll!00007ffdb87135cf() Unknown
OVRPlugin.dll!00007ffdb88e1347() Unknown
OVRPlugin.dll!00007ffdb88e1435() Unknown
OVRPlugin.dll!00007ffdb88e10f5() Unknown
OVRPlugin.dll!00007ffdb88e0a3f() Unknown
OVRPlugin.dll!00007ffdb88e0ab9() Unknown
OVRPlugin.dll!00007ffdb88e09b7() Unknown
OVRPlugin.dll!00007ffdb870512f() Unknown