watchOS4 global tint not applied properly - watchos-4

watchOS4 App's global tint seems to not applied sometimes.
watchOS4 temporarily changes app's tint to gray while it comes to front-most from background. After the app got into front-most, watchOS seems to change gray to it's original tint color.
However, watchOS4 sometimes not changes tint color to original one. Still grayed.
I found some scenarios:
Install watchOS app and watchOS launches it background automatically due to update complication: 100% grayed.
When update existing watchOS App that is running through TestFlight: 100% grayed.
Kill the app and re-launch: Works well.
When user launches the app that is not running in background: Works well.
PS. All tests are performed with 1st gen. (mentioned as series 0)
Any clues will be welcomed.
Thanks for reading this.

This problem is fixed in watchOS 4.2 beta 1.

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