Line disappears with big zoom

Hello.

I need to draw line in my plugin. I create stream from string (for example) "q 0 1 0 RG 0.12 w 0 878.742 m 0 1133.86 l S Q". Then i use AVPageViewDrawCosObj. In common cases everything is OK. But with big zoom (for 100cm x 100 cm page big zoom is 750+, for 600cm x 400cm - 120+) line desappears. Different lines disappears with different zoom, but disappears all lines. What could be theproblem?

Thank you.