ISM component causes memory issue on mobile

Hello friends. I have a problem with ISMs.

When i try to add a new ISM component for instancing android gives a warning while app opening (memory critical) and app goes foreground (stops working.)

BUT if i add the same mesh individually to the map, everything works fine.

My project really clean and there arent big assets. Max texture size 512 and 3d assets really low poly.

What is the situation here?