GameTest API error when trying to get the projectile from "projectileHit" or any other projectile related event.

I frequently use the GameTest API for my addons, before the 1.20 update everything worked well but now the "projectileHit" after-event is giving me some issues. I am able to use all the properties of the event except the "projectile" one, in order to get the respective entity. If I try to access any property of the entity, such as "typeId", it will throw the error:
"[Scripting][error]-Error: Failed to get property 'typeId' at <anonymous> (main.js:4)".

My addon uses this event and I can't launch it if this doesn't work.

Steps to Reproduce:

• Step 1: create a simple addon that uses the "minecraft/server" module.

• Step 2: create a script that contains the following code:

  import { world } from "@minecraft/server";
  
  world.afterEvents.projectileHit.subscribe(event => {
      const a = event.projectile.typeId;
  });

• Step 3: add the addon to a world, enable the experiment "Beta APIs" and throw any projectile to a mob.

Observed Results:
The script throws the error "[Scripting][error]-Error: Failed to get property 'typeId' at <anonymous> (main.js:4)", therefore you can't get the projectile that triggered the event.

Expected Results:
The provided code should set the "a" variable to the typeId of the projectile, for example, "minecraft:arrow".

Screenshots/Videos:
https://i.imgur.com/GgCKdBy.mp4

Notes:
This issue also seems to affect other events where you can access a projectile. I tried debugging the code with VS Code but when I expand the projectile property in the "Variables" section it just keeps loading and doesn't show anything.