Incorrect behavior in `distance()`

[dfriend21]

I've found some incorrect behavior when using distance() with a SpatRaster and a SpatVector. In particular, when finding a raster representing the distance from lines or polygons, the distance is only calculated from the vertices (plots 1 and 3, below). In the case of polygons, the entire area covered by the polygon is correctly represented as having distance 0, but the distance for areas outside the polygons uses the vertices only (plot 1). When rasterize = TRUE, the distance is calculated as I would expect - the distance from the entire line or polygon, not just the vertices (plots 2 and 4).

I see the following sentence in the documentation for distance: "For lines and polygons this is done after rasterization; and only the overlapping areas of the vector and raster are considered (for now)." Based on this, I'm assuming that rasterization is supposed to always happen for lines and polygons, but this isn't the case right now.

library(terra)
#> terra 1.7.73

v <- vect(system.file("ex/lux.shp", package = "terra"))
r <- rast(system.file("ex/elev.tif", package = "terra"))

v_simp <- simplifyGeom(v)
plot(v, border = "gray", main = "original and simplified polys")
polys(v_simp, border = "red")

# find the distance from the simplified polygons
d2 <- distance(r, v_simp, progress = FALSE)
d2b <- distance(r, v_simp, rasterize = TRUE, progress = FALSE)

# repeat for lines
v_simp_l <- as.lines(v_simp)
d3 <- distance(r, v_simp_l, progress = FALSE)
d3b <- distance(r, v_simp_l, rasterize = TRUE, progress = FALSE)

par(mfrow = c(2,2))
plot(d2, main = "1: polygons, rasterize = FALSE")
plot(d2b, main = "2: polygons, rasterize = TRUE")
plot(d3, main = "3: lines, rasterize = FALSE")
plot(d3b, main = "4: lines, rasterize = TRUE")

^{Created on 2024-03-19 with reprex v2.0.2}