I was playing random map from common maps in 1.6 patch

this forest nothing created me only

https://i2.paste.pics/45732c92c4739ad2d3ccc37ffd2cbadc.png

I assume you mean Black Forest, as there would be nothing wrong with a Forest Nothing map that is mostly trees...

Now, did you use the map Black Forest or Black Forest with Fixed Positions? I'd bet on the second case and, since that script only works for 6 or 8 players, you got that generation with only 2.

ok, now i understand.
is there a way to pick a map pool to avoid such cases? I usually play 1v1
or i should pick a certain map every time?

If you mean the random map pools, those don't have fixed positions so there won't be an issue.
If you just want to play black forest, select the one without fixed positions. All four combinations of fixed positions and allied vision ara available in the common maps.