41.00 Cooking Error - VerseBuild: Error Only During Cook

Summary

I have started getting the following errors only on cooking after 41.00. There are many of them but this is an example.

"Script error 3506: Unknown member MI_ProgressBar_Linear_Basic_3D_Inst_material in VF_MATERIALS.
Used inside class

But as you can see in the screenshot. it exists in the Assets.Digest.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Verse

Steps to Reproduce

All I did was change some verse files and start a session after the update 41.00

Expected Result

No Cook Errors

Observed Result

Cook Errors related to verse but they don’t happen locally

Platform(s)

windows

Island Code

1786-9954-3391

Upload an image

Screenshot 2026-06-06 153558.png

FORT-1113848 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.

I have the same issue with this material (worked yesterday) and is present in the digest

VerseBuild: Error: C:/build/FortniteGame/Plugins/GameFeatures/57fffa47-4a21-78d1-5063-e7a6b7cbe0bb/Content/petter.verse(584,8, 584,27) : Script error 3506: Unknown identifier Mat_Pet_Bar_Sprite1. Used inside function /sloth_games@fortnite.com/GrowAFarm/operator’.NewSetMeter’.

I believe it is one borrowed from the official UI project but getting cook errors today, wonder if it’s one of the material functions (maybe because it has Icon as a parameter name?)