Incorrect pixmap bounds on scale with artboard

[GDreyV]

Hello, one more issue with bounds on scale now with artboards. Here's example from sample I used. Actual is what I got from pixmap bounds and expected is just calculations.
scale 1:
expected: {"top":1570,"left":2329,"bottom":1608,"right":2355}
actual: {"top":1570,"left":2329,"bottom":1608,"right":2355}
scale 0.67 (not valid):
expected: {"top":1047,"left":1553,"bottom":1072,"right":1570}
actual: {"top":1033,"left":1523,"bottom":1058,"right":1540}
scale 2:
expected: {"top":3140,"left":4658,"bottom":3216,"right":4710}
actual: {"top":3140,"left":4658,"bottom":3216,"right":4710}
scale 2.67 (not valid):
expected: {"top":4187,"left":6
211,"bottom":4288,"right":6280}
actual: {"top":4173,"left":6181,"bottom":4274,"right":6250}
Code and sample image available in case.zip.