Magenta Flickers in Wiimm's Mario Kart Fun 2018-09

[SCOTT0852]

In certain tracks in Wiim's MK Fun 2018-09 (or while pausing in any track) the screen flashes magenta and a speedometer appears in the bottom-right corner of the magenta screen. When I use OpenGL the flashing is much more common and occurs on more tracks. Vulkan causes the flashing on the pause screen to stop, but still flashes occasionally mid-race. (I usually use d3d11) After spending 20 minutes getting in a race in software rendering, the flashing does not occur and the speedometer shows properly. This flashing does not occur in unpatched Mario Kart Wii, so it's something with Wiimm's pack. I haven't tested it on real hardware, but the speedometer looks like the one in CTGP-R (which can't be tested since it crashes immediately in dolphin, apparently it's for anti-cheat purposes). Anyone know how I can fix this since it's kind of annoying?