On first opening KMail on Wayland, the window and widgets load, then it crashes before the E-mail view widget loads.

KDE's crash wizard won't spawn but I've run KMail from gdb to retrieve this backtrace:

#0  0x00007fffde284e42 in gl::GLSurfaceGLXQt::Initialize(gl::GLSurfaceFormat) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#1  0x00007fffde26f0e8 in gl::init::CreateOffscreenGLSurfaceWithFormat(gfx::Size const&, gl::GLSurfaceFormat) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fffe02b5a8d in gl::init::CreateOffscreenGLSurface(gfx::Size const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fffe232a927 in gpu::GpuChannelManager::GetDefaultOffscreenSurface() ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fffe232d8f0 in gpu::GLES2CommandBufferStub::Initialize(gpu::CommandBufferStub*, GPUCreateCommandBufferConfig const&, std::unique_ptr<base::SharedMemory, std::default_delete<base::SharedMemory> >) () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fffe2328e16 in gpu::GpuChannel::OnCreateCommandBuffer(GPUCreateCommandBufferConfig const&, int, base::SharedMemoryHandle, gpu::ContextResult*, gpu::Capabilities*) () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fffe2326adf in bool IPC::MessageT<GpuChannelMsg_CreateCommandBuffer_Meta, std::tuple<GPUCreateCommandBufferConfig, int, base::SharedMemoryHandle>, std::tuple<gpu::ContextResult, gpu::Capabilities> >::Dispatch<gpu::GpuChannel, gpu::GpuChannel, void, void (gpu::GpuChannel::*)(GPUCreateCommandBufferConfig const&, int, base::SharedMemoryHandle, gpu::ContextResult*, gpu::Capabilities*)>(IPC::Message const*, gpu::GpuChannel*, gpu::GpuChannel*, void*, void (gpu::GpuChannel::*)(GPUCreateCommandBufferConfig const&, int, base::SharedMemoryHandle, gpu::ContextResult*, gpu::Capabilities*)) () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fffe2328022 in gpu::GpuChannel::OnControlMessageReceived(IPC::Message const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fffe2329bbd in gpu::GpuChannel::HandleMessageHelper(IPC::Message const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fffdf7f68d9 in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fffdf817da0 in base::MessageLoop::RunTask(base::PendingTask*) () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fffdf8187fd in base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fffdf818ae7 in base::MessageLoop::DoWork() [clone .part.156] [clone .constprop.178] ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fffdf814679 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007fffdf83abcf in base::RunLoop::Run() () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007fffdf85c71f in base::Thread::ThreadMain() () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007fffdf857d80 in base::(anonymous namespace)::ThreadFunc(void*) () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007fffea8946ba in start_thread (arg=0x7fff6d7fa700) at pthread_create.c:333
#18 0x00007ffff4fe841d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109