Heavy underextrusion on any line break

Hi everyone. I've got V-core 3.1 200mm with ldo orbiter 2.0 and rapido HF hotend. The printer worked fine for a month, but now it has sever underextrusion whenever extruder breaks a line, most prominently on Z seam. I initially thought it's due to pressure advance calibration (I've folloswed Elli's pattern guide for that), but since recalibration didn't help at all I've tried tower method. This is what I get every time I try a print. My full config can be found here: https://github.com/smumriak/ratrig_bunny_klipper, all my overrides are located in Bunny folder. Printing with Overture PETG, 0.4mm nozzle, 0.2mm layer height, flow rate 0.96, hotend temperature 240 for first layer, 250 for subsequent, coolying 50%. I've tried lowering speed, lowering acceleration, decreasing corner acceleration, disabling retraction in slicer and in RatOS files. No change at all.