When I click the capture GPU frame button in the debug bar when running my iOS app, Xcode says No capture boundary detected and therefore isn't able to show me a frame capture. This happens even though draw is getting called for my MTKView before I click the capture GPU frame button, and a call to the command buffer's present() method is in the draw method (I haven't done anything to set a default capture scope since this method call is there). What's causing this? I can provide more details on my implementation if necessary. I tried this in Xcode 9.4.1 and Xcode 10.0 beta 6 running the app on two iOS devices, both of which are running iOS 11.4.1.
Thanks!