Describe the bug
see: microsoft/vcpkg#12565

I know your team usually generates a new set of images every week. But, the build script always take vcpkg from master, it is kind of dangerous. Please consider to use tags. The issue 12565 is an example, if you rebuild the image now, you'll have the bug, and would break all the vcpkg Windows users.

Area for Triage:
C/C++

Question, Bug, or Feature?:
Bug

Virtual environments affected

• Windows Server 2016 R2
• Windows Server 2019

Expected behavior
Rebuild the image
Try to use vcpkg to install protobuf/libffi or some other open source libraries
The should work fine

Actual behavior
It fails, even through it's not your fault. Here just kindly remind you there is a problem. Please feel free to close this issue without taking extra actions.