A small sample app for this issue is from libpcg, tests/reactdiff_2d in TURING mode (it's most visible there). It's drawing a single texture that's evolving over time. After the texture has been updated, the first drawing of it will draw four sub-triangles of (presumably) the first triangle drawn, using data from the previous texture that was used. Resizing the window to make it redraw makes the misrendering go away. It's somewhat visible while using the app, and very prominent when quitting the app while the texture is light-colored, then restarting. The stale data will actually persist across X Server restarts. Hacking up a fix for #5147 doesn't fix this.
z/c cache issues? texenv seems to have similar problems.
Shouldn't be Z, since this demo (and texenv as well, afaik) doesn't use Z.
Looks like some ddx operation is causing this. Moving another window on top of it makes it worse.
Should work a alot better now. Multi texturing with s3tc still shows similar squares as nwn and texcmp previously but I have not been able to figure out whats going on yet.
Fixed long time ago.
Mass version move, cvs -> git
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