Underextrusion?

My prints were coming out fine last week and if I print the same gcode now the top layer is always patchy. Anything I print ends up like this, ran some other flow tests and everything seems to be in order but the corners come out weird. I assume the two might be related. I'll also list some other variables I have tried to test.

Nozzle: .4, swapped to fresh one, no difference.
Flow rate: more or less makes no difference.
Temp: more or less makes no Diddy
Extruder tension: orbiter 2, tighter or looser makes no difference.
Pressure advance: on or off makes no difference.
Filament: confirmed 1.75 and different spools have similar problems.
Parts cooling: makes no difference.
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