sit_event and stand_event in component : sittable doesn't work for custom mobs

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I can confirm this is (still) a bug.

I created a custom entity with some functionality, and one of the things I added was the ability to sit. It does sit, but I cannot get it to change/execute behavior when it's sitting. It appears the minecraft:sittable code doesn't work for custom entities:

"minecraft:sittable":

{ "sit_event": "minecraft:taking_a_seat", "stand_event": "minecraft:time_to_go" }

Steps to reproduce, add the following:

Component group to enable sitting:

 
        "buckbeak:tame": {
          "allow_sitting": true,
          "minecraft:sittable":

{             "sit_event": "buckbeak_sitting",             "stand_event": "buckbeak_standing"           }

,
          "minecraft:behavior.stay_while_sitting":

{             "priority": 0           }

}
 
Then the sittable event:
 
      "events": {
        "buckbeak_sitting": {
          "add":

{             "component_groups": [               "buckbeak_sitting"             ]           }

        }
and then the component group (in this case, I want to set it on fire when sitting so I can easily see the code is working:
 
      "component_groups": {
        "buckbeak_sitting": {
          "minecraft:is_ignited": {}
        }
 
 
Nothing ever happens. Other parts, like the "on_leash" event and subsequent component group do trigger.
 

This is on the Windows 10 (bedrock) version

 EDIT: apologies for the crappy code, the editor doesn't outline that well