Wrong bounding box calculated, caused by G2 in ZX plane (OK in CNCjs)

[Billiam]

The X/Y min/max range can report incorrectly for shopfloor tablet on some files, and I've tracked it down to vertical arc lead out moves:

Here's a minimal example, extracted from a facing operation:

G90 G94
G17
G21

(Face)
S16000 M3
G54
G0 X146.905 Y0.418
Z15
Z5
G1 Z0.435 F1000
G18 G3 X146.27 Z-0.2 I-0.635 K0
G1 X142.986
X-0.244 F1430
G17 G2 X-0.244 Y2.396 I0 J0.989
G1 X142.986
G18 G2 X143.621 Z0.435 I0 K0.635 F1000
G0 Z15
G17

Shopfloor tablet reports this having file having a range of: X: -1.23 - 146.91, and Y: 0.42 - 146.91.
CNCJS correctly reports this as X: -1.233 - 146.905, and Y: -0.418 - 2.396

The last curve: G18 G2 X143.621 Z0.435 I0 K0.635 F1000 ends up getting converted to start coordinates of x: -0.2, y: 142.968, z: 2.396 by the G2 handler, causing the wrong bounding box for the Y axis.