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Doing an animation on an image about the Y-axis in a StackLayout causes the image to disappear intermittently. Issue seems to exist solely on Android 5.1 (API 22). Doing a rotation about a different axis, as well as doing the same rotation in a different layout does not cause this issue to appear.
Created attachment 12663 [details]
Project demonstrates the issue versus how rotations look in absolute and relative layouts.
I actually notice the intermittent disappearing when the emulator is rotated, but do see that it's an API 22 issue based on it not happening in one on API 19, using Forms 22.214.171.12404-pre3.
Due to the age of this issue, we no longer believe it affects the current version of Forms. If the behavior is in fact occurring (specifically within Lollipop or newer using AppCompat) as of the latest prerelease or nightly build, please reopen with an updated reproduction project.