Dolphin doesn't seem to scale internal res properly in fullscreen

[60fps Hack]

Noticing some weird internal res scaling with Dolphin, or to be clear the lack of it. Note that something is being done as performance-wise I definitely notice a difference with the internal resolution setting, but the quality is largely dependent on my desktop res. If anything when my desktop is set at 1080p, setting the internal res at 3X actually looks a little better than 6X. When my desktop is set to downscale at 4K (I only have a 1080p display), and I run the game at 6X internal res, then it looks as I would expect - completely smooth with virtually no aliasing.

Here's some shots with the settings displayed in the upper left. MSAA was left off as it doesn't seem to do much when my desktop is at 1080p and the internal res is high, but also to clearly illustrate the lack of downsampling that should be occurring if the game was rendering as I would expect at such a high internal resolution. Note the umbrella of Princess Peach and Mario's cap, apologies for imgur's crappy compression of png's but even with that the aliasing should still be apparent.

Using a Radeon RX560 4GB, Adrenaline drivers 18.9.1

1. Internal res 6X, desktop native res 1080p



2. Internal res 3X, desktop native res 1080p



3. Internal res 6x, desktop res downscaled 2160p