Must draw tiles before adding wall sprites

SDK Bug Reports
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1

I have to draw tile map tiles before I add wall sprites. This seems odd.

This code displays the sprites correctly:

local pd <const> = playdate
local gfx <const> = pd.graphics

local imagetable, error = gfx.imagetable.new("Tilemap/walls")
assert(imagetable, error)

local wallsTilemap <const> = gfx.tilemap.new()
wallsTilemap:setImageTable(imagetable)
local tiles = {
    1, 2, 3,
    4, 0, 6,
    7, 8, 9
}
wallsTilemap:setTiles(tiles, 3)
wallsTilemap:draw(0,0)
local collisionSprites = gfx.sprite.addWallSprites(wallsTilemap, {0})
for i = 1, #collisionSprites do
    gfx.sprite.addSprite(collisionSprites[i])
end

Tiles displaying correctly

Moving wallsTilemap:draw(0,0) after the gfx.sprite.addWallSprites line causes the sprites not to display though.

local pd <const> = playdate
local gfx <const> = pd.graphics

local imagetable, error = gfx.imagetable.new("Tilemap/walls")
assert(imagetable, error)

local wallsTilemap <const> = gfx.tilemap.new()
wallsTilemap:setImageTable(imagetable)
local tiles = {
    1, 2, 3,
    4, 0, 6,
    7, 8, 9
}
wallsTilemap:setTiles(tiles, 3)
local collisionSprites = gfx.sprite.addWallSprites(wallsTilemap, {0})
wallsTilemap:draw(0,0) -- <= I've just moved this line.
for i = 1, #collisionSprites do
    gfx.sprite.addSprite(collisionSprites[i])
end

Tiles not displaying