Pokemon Stadium missing ground texture #412 reveals the problem:
the game loads the same texture into tile0 and tile1.
The only difference is ShiftScale values.
Since the checksum is the same, the same CachedTexture is used for both tiles.
Shift scale correction ovrwrites ShiftScale for tile0 when tile1 is loaded.
Thus, texture coordinates for both tiles will be same.
Combiner uses (tile0-tile1)*env_a+shade. Since t0==t1, texture component is missing.
Solution: calculate ShiftScale for each tile right before use.
Fixed#412
