Meta's handling of xrCreateVulkanInstance requests duplicate extensions, causing crashes

Trying to execute a VR game with Vulkan when OpenXR runtime is set to Meta causes crashes before the application starts, although not always.

I have checked with an empty Unity project that it only happens with Vulkan and Meta runtime environment.

After much searching, it led me to this thread on the Unity forums from late 2023, early 2024, where someone from the support team clarifies that it is a problem on Meta's part, and they make that clear in this bug report.

It's been over a year since this bug was reported to Meta by Unity itself and it still hasn't been fixed, we're unable to progress in the development of our game because of this bug.

We need a fix for this critical bug ASAP.