kwin has multiple failing autopkgtests in test environment

KWin has multiple failing tests in autopkgtests, although functionally everything seems ok to the users who have tested the new stack. These failures may be down to the test environment being not a real desktop.

Test #19: kwin-testStart .........................***Exception: SegFault 5.47 sec
Test #20: kwin-testTransientNoInput ..............***Exception: SegFault 5.00 sec
Test #21: kwin-testQuickTiling ...................***Exception: SegFault 4.99 sec
Test #22: kwin-testMoveResize ....................***Exception: SegFault 5.01 sec
Test #23: kwin-testDontCrashGlxgears .............***Exception: SegFault 5.01 sec
Test #24: kwin-testLockScreen ....................***Exception: SegFault 5.01 sec
Test #25: kwin-testDecorationInput ...............***Exception: SegFault 5.01 sec
Test #26: kwin-testInternalWindow ................***Exception: SegFault 5.00 sec
Test #27: kwin-testTouchInput ....................***Exception: SegFault 5.01 sec
Test #28: kwin-testInputStackingOrder ............***Exception: SegFault 4.99 sec
Test #29: kwin-testPointerInput ..................***Exception: SegFault 4.99 sec
Test #30: kwin-testPlatformCursor ................***Exception: SegFault 5.00 sec
Test #31: kwin-testDontCrashCancelAnimation ......***Exception: SegFault 5.00 sec
Test #32: kwin-testTransientPlacmenet ............***Exception: SegFault 4.98 sec
Test #33: kwin-testDebugConsole ..................***Exception: SegFault 4.99 sec
Test #34: kwin-testStruts ........................***Exception: SegFault 5.00 sec
Test #35: kwin-testShade .........................***Exception: SegFault 5.00 sec
Test #38: kwin-testPlasmaWindow ..................***Exception: SegFault 5.00 sec
Test #39: kwin-testPlasmaSurface .................***Exception: SegFault 5.01 sec
Test #40: kwin-testMaximized .....................***Exception: SegFault 4.99 sec
Test #41: kwin-testShellClient ...................***Exception: SegFault 5.01 sec