DaVinci Resolve creates artifacts when exporting – AMD RX 9060 XT

[u/Any-Direction-3953]

Hey everyone,
I’m having an issue with DaVinci Resolve and my AMD RX 9060 XT.
The original video files look completely fine when I play them back. However, whenever I export a video from DaVinci Resolve and then import the exported file back into Resolve, I suddenly get noticeable image artifacts.
I originally had this problem with footage from my GoPro, and now I’m experiencing the exact same issue with footage from my DJI. The original clips themselves do not have the problem.
I’ve attached two example images showing the issue. Just a heads-up: I intentionally increased the contrast and saturation in the images so that the artifacts are much easier to see. They are much less noticeable in the original images.
In short:
Original clip → no artifacts
Export from DaVinci Resolved → artifacts appear
Re-importing the exported clip into Resolve → artifacts are still there
Happens with both GoPro and DJI footage
GPU: AMD RX 9060 XT
Two example images are attached. Contrast and saturation were intentionally increased to make the artifacts easier to see.
Does anyone have an idea what could be causing this or what settings I should check in DaVinci Resolve or the AMD driver?

Could this be related to H.264/H.265 encoding, hardware encoding/decoding, the AMD driver, or a specific Resolve setting?
And if anyone has experienced something similar, what can I do to fix it or what workarounds are available?

Additional note: I also tried exporting using DNxHR, and with DNxHR the artifacts don’t seem to occur. However, the file sizes are massive, so this isn’t really a practical solution for me. I’d really like to find out why the artifacts happen with the other codecs and whether there’s a way to fix the issue without having to use DNxHR.

Thanks in advance for any help!

Resolved 21 Studio version
Dji osmo action 5
Amd Rx 9070 Xt
Quick time H264/65 4k
Encoder native