To reproduce:
1. Open attached project "ios-test-project.zip"
2. Make sure that Graphics API is set to Metal
3. Build for iOS device
4. Deploy the Xcode project to an iOS device
5. After the project is loaded in Xcode menu bar press Debug > Capture GPU Frame
6. Observe as there are three additional screen sized textures

Expected result: no additional screen size textures are created
Actual result: capturing a GPU frame shows three additional screen size textures

Reproduced on:
2017.4.0f1 2017.4.30f1 2018.4.3f1 2019.1.9f1 2019.2.0b9

Devices reproduced on:
iPad Mini 2 iOS 11.4.1
iPad Air 2 iOS 12.0.1
iPhone 8 iOS 11.0

Notes:
- Xcode crashes when trying to capture GPU frame on iPhone X iOS 13.0
- The button to take GPU capture is not available after building with 2019.3.0a9
- Doesn't reproduce on OpenGLES2 and OpenGLES3