This is the same model with overlay flag and texture with alpha chanel, dds/tga nevermind - same results (except for dds 1bit where i don't have this problem but result is bad). With PNG texture results is good as before, but png eat to much memory and i want use dds or tga. The good tree next to problematic tree is just copy/paste.

This problem is not related only with this tree model, this happening in whole game, and i think the problem is related to engine or graphic driver, but unfortunately at this moment i do not have second pc to test with diferent graphic card and driver.

The most annoying thing, everything works fine in last five years on different pc, and now i need figure out why this happening

Here i found one my old level picture (the first one) where everything work good, and the second one is with overlay problem.