I've noticed that some textures with normalmaps now have a blotchy appearance in 2.09 if viewed from a sharp angle:
The problem disappears if I either:
comment out the normalmap in the material definition
set image_useNormalCompression 0
revert to TDM 2.08
It affects for example textures/darkmod/wood/boards/polished_01, but not textures/darkmod/stone/brick/blocks_large_sandstone.
This is on a PC with Intel UHD 630, Intel i5-9400F. Got a console log he