Snapping to axonometric grid with unequal angles is wrong (w/ default y-axis direction)

Steps to reproduce:

• open Inkscape
• Create new file
• Go to document settings and create new axonometric grid
• Disable default rectangular grid
• Change X or Z angle to something other than 30°
• Snap to grid must be enabled
• Draw line, see where the cursor snaps

What happened?

Cursor snaps to the "old" grid with 30° angles (so basically to an invisible/nonexistent grid)

What should have happened?

Cursor should snap to the active visible grid

Inkscape Version and Operating System:

• Inkscape Version: 1.0beta1 (fe3e3069, 2019-09-17)
• Operating System: Windows 10
• Operating System version: 1803