Tileset export PNGs have all black index colors

[ShinkoNet]

on Aseprite v1.3-rc1
It keeps the transparent flag on the index I chose, but their data is all black and the palette is filled all the way to 255.
I've tested it with regular cel layers and those export their PNGs fine.

Result (tileset2.png)

Expected (Done with aseprite's built-in spritesheet export)

Here's my aseprite file: sarah-neutral.zip