Spine Unity runtime cannot import animation

[HotkeyM]

I tried to export animation with File->Export, Type = Spine, Data Version = 3.3 to import with Spine runtime for Unity claimed to support 3.3 version.

First, it failed to import because original Spine format header has "skeleton":{"hash":"your hash there"} section. I commented that checking, but Spine runtime still continued to raise exception. It also fails on the first animation loading with exception, with KeyNotFoundException.