Reproduction steps:
1) Open user's attached project
2) Build and run it on a device which can share screen with other devices
3) Press home button (leave app running in background)
4) Start screen sharing with other device
5) Open already running application

Expected result:
Both screens are rendering as intended.

Actual result:
Screen on both devices becomes black.

Regression appeared in 5.3.4p6

Reproduced with:
5.6.0a6, 5.5.0p1, 5.4.3p2, 5.3.7p2, 5.3.4p6

Unable to reproduce with:
5.3.4p5

DUT:
LG G5, Android 6.0
LG G3, Android 5.1
Sony Xperia Z4 Tablet, Android 6.0

Devices which were used as second screen:
Samsung DB48E (Smart TV)
Sony Xperia Z4 Tablet