Donkeys don't seem to be spawning anymore

I have been searching for a donkey for ages to no avail.
MCWIN10 0.16.2

Confirmed to affect 1.0.0. An analysis of horse.json in the vanilla behavior pack reveals this:

{
  "weight": 5,
  "filters": {
    "other_without_families": "player"
  },
  "add": {
    "component_groups": [
      "transform_into_donkey"
    ]
  }
}

The filters seem to be preventing them from spawning at all. I tested this by making it so that spawning a donkey had the greatest weight, and the result was that almost no horse variants spawned at all. When I removed the filter, suddenly donkeys would spawn all over the place. Perhaps the game is using a fake/simulated player to spawn entities? The filter is clearly intended to make horse spawn eggs spawn only horses, but this filter is apparently also affecting natural spawning as well.

Affecting 1.0.2.

Fixed in 1.0.4.0.