I am using

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Fiji [Radeon R9 FURY / NANO Series] [1002:7300] (rev ca) (prog-if 00
[VGA controller])

on Fedora 25 running GNOME 3 with Mesa git and LLVM git on two 4K monitors.
When using Wayland, there is a noticeable flickering in the upper part of the
screen when switching between desktops. Nothing relevant is shown in dmesg.

Also, when using Xorg, everything works fine.

Would a screenshot be useful? Any other info I can provide?