QQuickFrameBufferObject fails in Angle builds

Testing tst_QQuickFramebufferObject
FAIL! : tst_QQuickFramebufferObject::testThatStuffWorks(blue, aa, item-size) Compared values are not the same
Actual (result.pixel(0, 0)): 4294967295
Expected (color) : 4278190335
tst_qquickframebufferobject.cpp(207) : failure location
FAIL! : tst_QQuickFramebufferObject::testThatStuffWorks(pink, aa, 80x80) Compared values are not the same
Actual (result.pixel(0, 0)): 4294967295
Expected (color) : 4294902015
tst_qquickframebufferobject.cpp(207) : failure location
Totals: 5 passed, 2 failed, 0 skipped
QtQA::App::TestRunner: test failed, running again to see if it is flaky...
********* Start testing of tst_QQuickFramebufferObject *********
Config: Using QtTest library 5.3.1, Qt 5.3.1
PASS : tst_QQuickFramebufferObject::initTestCase()
PASS : tst_QQuickFramebufferObject::testThatStuffWorks(red, !aa, item-size)
PASS : tst_QQuickFramebufferObject::testThatStuffWorks(green, !aa, 80x80)
QDEBUG : tst_QQuickFramebufferObject::testThatStuffWorks(blue, aa, item-size) QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QDEBUG : tst_QQuickFramebufferObject::testThatStuffWorks(blue, aa, item-size) QOpenGLFramebufferObject: Framebuffer incomplete attachment.
FAIL! : tst_QQuickFramebufferObject::testThatStuffWorks(blue, aa, item-size) Compared values are not the same
Actual (result.pixel(0, 0)): 4294967295
Expected (color) : 4278190335
tst_qquickframebufferobject.cpp(207) : failure location
QDEBUG : tst_QQuickFramebufferObject::testThatStuffWorks(pink, aa, 80x80) QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QDEBUG : tst_QQuickFramebufferObject::testThatStuffWorks(pink, aa, 80x80) QOpenGLFramebufferObject: Framebuffer incomplete attachment.
FAIL! : tst_QQuickFramebufferObject::testThatStuffWorks(pink, aa, 80x80) Compared values are not the same
Actual (result.pixel(0, 0)): 4294967295
Expected (color) : 4294902015
tst_qquickframebufferobject.cpp(207) : failure location
QDEBUG : tst_QQuickFramebufferObject::testInvalidate() QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QDEBUG : tst_QQuickFramebufferObject::testInvalidate() QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QDEBUG : tst_QQuickFramebufferObject::testInvalidate() QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QDEBUG : tst_QQuickFramebufferObject::testInvalidate() QOpenGLFramebufferObject: Framebuffer incomplete attachment.
PASS : tst_QQuickFramebufferObject::testInvalidate()
PASS : tst_QQuickFramebufferObject::cleanupTestCase()
Totals: 5 passed, 2 failed, 0 skipped
********* Finished testing of tst_QQuickFramebufferObject *********