Pitch/Yaw ignored when spawning display entities

[tal5]

Expected behavior

For pitch and yaw to be used when spawning, as with other entities.

Observed/Actual behavior

When spawning a display entity, pitch and yaw seem to be ignored and always become 0.

Steps/models to reproduce

Location location = player.getEyeLocation();
getLogger().info(location.toString());
Display display = player.getWorld().spawn(location, BlockDisplay.class);
getLogger().info(display.getLocation().toString());
getLogger().info(String.valueOf(display.getLocation().equals(location)));

Running the above code will log the first location with the player's yaw and pitch, then the display's location with 0 yaw and pitch, then show that they're not equal:

[23:44:07 INFO]: [PaperTestPlugin] Location{world=CraftWorld{name=world},x=-108.5082338140295,y=101.99942319657657,z=354.9048698050415,pitch=90.0,yaw=162.454}
[23:44:07 INFO]: [PaperTestPlugin] Location{world=CraftWorld{name=world},x=-108.5082338140295,y=101.99942319657657,z=354.9048698050415,pitch=0.0,yaw=0.0}
[23:44:07 INFO]: [PaperTestPlugin] false

Plugin and Datapack List

> plugins
[23:54:02 INFO]: Server Plugins (1):
[23:54:02 INFO]: Bukkit Plugins:
[23:54:02 INFO]:  - PaperTestPlugin

> datapack list
[23:54:21 INFO]: There are 2 data pack(s) enabled: [vanilla (built-in)], [file/bukkit (world)]
[23:54:21 INFO]: There are no more data packs available

Paper version

> version
[00:00:49 INFO]: Checking version, please wait...
[00:00:50 INFO]: This server is running Paper version git-Paper-56 (MC: 1.20.1) (Implementing API version 1.20.1-R0.1-SNAPSHOT) (Git: 2c9c5e4)
You are running the latest version
Previous version: git-Paper-54 (MC: 1.20.1)

Other

I understand that generally you'd use the built-in transformation and not the base yaw/pitch, but I believe there's still a benefit to fixing this if possible (e.g. custom entity systems with generic logic and whatnot).
Especially seeing as this works fine in vanilla commands: /summon block_display ~ ~ ~ {Rotation:[50F,50F],block_state:{Name:"minecraft:grass_block"}}

[Owen1212055]

Related to #5462
In general, I think the spawning logic bukkit has should be cleaned up because there's no reason why pitch/yaw should be excluded like this.

[Black-Hole]

Should be fixed by upstream and included in Paper with 2fa8efc

[Doc94]

Should be fixed by upstream and included in Paper with 2fa8efc

i think you mean this? that was for only Player rotation not?

[Darwin1546]

It's still present in Paper-117