Service var.set broken and do nothing after update to 0.15.3

[gamba69]

Hello, after update to 0.15.3 service var.set silently do nothing. Variable value and attributes not updated, and I don't see any error in log. This bug was fixed in 0.15.2 and now it's rise again. I see that await self.async_update_ha_state(True) in async_set returned, and if i change code to self.async_write_ha_state() all working again