This causes us crashes as well.
I've noticed this ticket is opened for nearly a year with full reproduction steps.
Can anyone verify a fix or a reliable workaround is coming?

I am seeing this issue on the Quest 2 and Pico 4 as well with Unity version 2022.3.35f1 and 2022.3.42f1. It seems to also relate to a potential crash that can occur if you attempt to load a Scene after warming up the shader variant.

I ran into this with my company's application where we are attempting to load a scene and related shader variant collection from a downloaded assetbundle. However, you can reproduce this crash pretty easily with simple sample project and I also discovered an interesting workaround to this issue that involves iteratively calling "WarmUpProgressively(1)" inside a coroutine and waiting for a frame between each call. While I cannot seem to attach a project via comment, all you really need is a simple script like so:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class TestLoader : MonoBehaviour
{
[SerializeField]
private bool _warmProgressive = false;

// Start is called before the first frame update
IEnumerator Start()
{
yield return new WaitForSeconds(2);

ShaderVariantCollection shaderVariantCollection =
Resources.Load<ShaderVariantCollection>("sampleShaderVariants");

if (_warmProgressive)
{
while (!shaderVariantCollection.WarmUpProgressively(1))
{
Debug.Log($"Shaders Warmed Up: {shaderVariantCollection.warmedUpVariantCount}");
yield return null;
}
}
else
{
shaderVariantCollection.WarmUp();
}

SceneManager.LoadScene("Scenes/SampleScene");
}

}

Where "sampleShaderVariants" is a shader variant collection of non-trivial size in your Resources directory and Scenes/SampleScene is a second scene in that you've built in. I just attach this script to an object in the primary scene in the build. If "_warmProgressive" is set to true everything is fine, but if it is false, I get this JobTempAlloc warning and the app will crash shortly after loading SampleScene.