How to get ui.Path to fill arbitrary polygons?

[CatsAndChaos]

I cannot get a Path to fill in a shape drawn using lines. Am I doing something wrong, is this a bug, or is this simply not supported? If it is one of the latter two, are there any alternatives?
Example:

import scene
import ui

with ui.ImageContext(100, 100) as ctx:
	ui.set_color('red')
	p = ui.Path()
	p.move_to(10, 10)
	p.line_to(30, 30)
	p.move_to(30, 30)
	p.line_to(10, 30)
	p.move_to(10, 30)
	p.line_to(10, 10)
	p.move_to(10, 10)
	p.stroke()
	p.fill()
	ctx.get_image().show()

This clearly creates a perfect triangle with no gaps, but all that results is the outline.

[cvpe]

When you do intermediate moves, you break the polygon, try without them

import scene
import ui

with ui.ImageContext(100, 100) as ctx:
ui.set_color('red')
p = ui.Path()
p.move_to(10, 10)
p.line_to(30, 30)
#p.move_to(30, 30)
p.line_to(10, 30)
#p.move_to(10, 30)
p.line_to(10, 10)
#p.move_to(10, 10)
p.stroke()
p.fill()
ctx.get_image().show()

[CatsAndChaos]

Thank you!