Reproduction steps:
1. Create a new project
2. Install Visual Effect Graph package
3. Create Visual Effect Graph Asset (Create > Visual Effects > Visual Effect Graph)
4. Double-click on it to open Visual Effect Graph window
5. Click on the dropdown icon next to the question mark icon and select “Learning samples” option
6. Observe the Console

Actual result: Multiple errors and warnings are thrown
Expected result: No errors or warnings are thrown

Reproducible with: 6000.0.60f1, 6000.2.8f1, 6000.3.0b6, 6000.4.0a2
Couldn’t reproduce with: 2021.3.57f1, 2022.3.67f1 (No “Learning samples” option)

Reproduced on: Ubuntu 24.04, Windows 11
Not reproduced on: macOS Sequoia 15.4 (M4)

Notes:

• Sometimes “Learning samples” need to be reinstalled for the issue to reproduce
• Full errors:

{code:java}
Problem detected while importing the Prefab file: 'Assets/Samples/Visual Effect Graph/17.3.0/Learning Templates/Prefabs/TurntableWithBackdrop_VFX.prefab'.The file might be corrupt or have a missing Variant parent or nested Prefabs. See details below.Errors: Prefab Variant problem. Missing Prefab Variant parent: 'TurntableWithBackdrop_VFX (Missing Prefab with guid: 0bc1879d774271a4bab62da6b2f6eac2)'
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&){code}
{code:java}
Problem detected while importing the Prefab file: 'Assets/Samples/Visual Effect Graph/17.3.0/Learning Templates/Prefabs/Cell_01.prefab'.The file might be corrupt or have a missing Variant parent or nested Prefabs. See details below.Errors: Nested Prefab problem. Missing Nested Prefab Asset: 'Platform (Missing Prefab with guid: 8c286bfd53914ce45b4d9eeaa086f505)' Nested Prefab problem. Missing Nested Prefab Asset: 'InfosStand (Missing Prefab with guid: 96048391e5bc0af49b1edfa6e3a2427c)' Nested Prefab problem. Missing Nested Prefab Asset: 'Panel (Missing Prefab with guid: a59dbba54631fed4f9eb6dee83208c1f)' Nested Prefab problem. Missing Nested Prefab Asset: 'UnityLogo (Missing Prefab with guid: ce956971d4da74746ad62e303cc5ce09)' Nested Prefab problem. Missing Nested Prefab Asset: 'TurntableWithBackdrop_VFX (Missing Prefab with guid: d7dbe18fcb282dd43b254ce6dacb970b)'
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) {code}
{code:java}
Problem detected while importing the Prefab file: 'Assets/Samples/Visual Effect Graph/17.3.0/Learning Templates/Prefabs/VFXG/Flipbook Mode.prefab'.The file might be corrupt or have a missing Variant parent or nested Prefabs. See details below.Errors: Prefab instance problem: 'Arrow (Missing Prefab with guid: 86af9fba10b3af04fb4791ef9f8be85e)'. 2 instances are missing the same Prefab Asset with guid 86af9fba10b3af04fb4791ef9f8be85e.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) {code}
{code:java}
Problem detected while importing the Prefab file: 'Assets/Samples/Visual Effect Graph/17.3.0/Learning Templates/Prefabs/VFXG/Flipbook Blending.prefab'.The file might be corrupt or have a missing Variant parent or nested Prefabs. See details below.Errors: Nested Prefab problem. Missing Nested Prefab Asset: 'Arrow (Missing Prefab with guid: 86af9fba10b3af04fb4791ef9f8be85e)'
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) {code}
{code:java}
Problem detected while importing the Prefab file: 'Assets/Samples/Visual Effect Graph/17.3.0/Learning Templates/Prefabs/VFXG/Sample Skinned Mesh.prefab'.The file might be corrupt or have a missing Variant parent or nested Prefabs. See details below.Errors: Nested Prefab problem. Missing Nested Prefab Asset: 'Chomper (Missing Prefab with guid: 2732fe64dd2799f439fb845921df626b)'
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) {code}