Odd TAA "edge splotting" on certain blocks

[0CCULTIST]

TAA sometimes creates splotches along the edges of certain blocks. Kind of looks like if you averaged the 2 colors and traced over the edge with a thin brush without anti-aliasing.

This doesn't occur (or at least not very noticeable) with most blocks and it happens regardless of settings or resource pack.

Mesa 25.2.6
RX 9060XT
Minecraft 1.21.8
Iris 1.9.6
Complementary r5.6.1

[EminGT]

Could this be an issue with Radeon 9000 series drivers or Mesa drivers? Because Im not seeing this on my end

[0CCULTIST]

Could this be an issue with Radeon 9000 series drivers or Mesa drivers? Because Im not seeing this on my end

It's a possibility but I'm not getting issues with BSL, Bliss, TAA Project or RRe36's implementation. I do with Mellow Shader's TAA though.

I've done more messing around and hopefully can give a better picture of what's going on:
This is most noticeable in badlands biomes, at noon, and really only occurs with red sand flanked by certain other blocks. The occurrence is based heavily on the current lighting conditions and to a slightly lesser extent the camera angle. The brighter the lighting conditions the more prevalent it is.

The splotches don't change color once they appear, they just slightly shimmer along the edges before disappearing, so it really looks like hard clipping to me.