First thought....waste of time having one process to print one line at .15mm height, then second process to print remainder at 0.075. But this is only a comment!
The issue is that the second process starting "off" the bed is creating a bridging layer. The code change that makes this happen was applied in v4.1.0...pre-v4.1.0 and normal infill occurs.
If the angle is alli mportant...then applying a bridging infill angle will give a workaround....