Lightning spawners render full lightning bolt

The bug

If a spawner is set to spawn lightning bolts, a full lightning bolt is displayed, unlike miniature models of entities as usual in a spawner. Previously, lightning bolts were not rendered and could not be spawned using a spawner, but that has since changed, and now a full lightning bolt is rendered, spinning around the spawner.

When a player leaves the area around the spawner, the lightning bolt freezes in place. While looking from certain angles (upwards) at this frozen lightning bolt, it can become invisible.

The expected behavior is that either:

• The lightning will not render at all and will not be spawnable by spawners, or
• The spawner will render miniature model of a lightning bolt instead of a full-sized one

How to reproduce

1. Give yourself a spawner using the command /give @s minecraft:spawner
2. Place the spawner in a set location (we'll call that location X Y Z)
3. Run command #1, as shown below
4. Run command #2, as shown below
5. Notice how a full lightning bolt is rendered from the spawner, with the same properties as described above

Commands

Command 1:

/data modify block <X> <Y> <Z> SpawnPotentials set value [{Entity: {id: "minecraft:lightning_bolt"}, Weight: 1}]

Command 2:

/data modify block <X> <Y> <Z> SpawnData set value {id: "minecraft:lightning_bolt"}

Video

Click this link to view this bug: https://youtu.be/kOufLlgOC3c

Side notes

• This bug was not present in 1.15.2
• This bug was present in 1.16.1
• The spawner in the video attached has had data values changed to accelerate the speed at which it spawns lightning bolts