udecal particle type always oriented upwards

[hemebond]

With the following particle definition:

// An expanding ring
r_part +TE_SPIKE
{
	type udecal
	blend premul_add
	texture "particles/particlefont"
	atlas 8 57
	count 0.3 0 0
	rgbf 0.00784314 0.14902 0.290196
	rgbrandf 0.0196078 0.54902 0.65098
	rgbrandsync 1 1 1
	alpha 1
	alphadelta -1
	scale 8 8
	scalefactor 1
	scaledelta 128
	die 10 10
}

I would expect the particle to be oriented with the surface, instead it's always pointing upwards

Particle type cdecal/decal is oriented correctly but it does not affected by scaledelta.