on_unleash event from minecraft:leashable isn't triggered when unleashing from a fence

Partner Rank:
2

Verification builds and Platforms:

1.11.0 Win10

Summary:

on_unleash event from minecraft:leashable isn't triggered when unleashing an entity from a fence.

Impact:

Inconsistent behavior when unleashing entities,
Breaks behavior in our Phantom Trainer map.

Repro Steps:

Create Phantom Trainer from template.
run "/tp 616 124 394"
Unleash the Phantom from the fence.
Leash the Phantom again and then unleash it from your hand.

Observed Results:

Game doesn't run the event when entity is unleashed from a fence.

Expected Results:

Game runs the event when entity is unleashed from a fence.

Screenshots/Videos attached: Yes
https://www.youtube.com/watch?v=p4g-8J02Klw