IssueTracker

Component used: DialogFragment

Version used:
androidx.activity:activity-compose:1.3.0-alpha02
androidx.fragment:fragment-ktx:1.3.0-beta01
androidx.compose.runtime:runtime:1.0.0-alpah12

Devices/Android versions reproduced on:
emulator Pixel 3 API 29

Sample code:

From any fragment calling TestDialogFragment using
TestDialogFragment().show(childFragmentManager, "Test")
or Navigation way:
findNavController().navigate(MainFragmentDirections.actionToTestDialog())

class TestDialogFragment : DialogFragment() {
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ) = ComposeView(requireContext()).apply {
        setContent {
            Surface {
                TestDialogLayout()
            }
        }
    }
}

Will cause the exception:
java.lang.IllegalStateException: ViewTreeLifecycleOwner not found from DecorView@bec849f[MainActivity]
        at androidx.compose.ui.platform.WindowRecomposerKt.createLifecycleAwareViewTreeRecomposer(WindowRecomposer.kt:231)

Can be manually fixed by setting the ViewTreeLifecycleOwner in onCreateView at the beginning:
dialog?.window?.decorView?.let {
    ViewTreeLifecycleOwner.set(it, viewLifecycleOwner)
}