please make sure you are using the latest ETF version before submitting an issue, you might also find a dev build
fixing this issue already on my discord https://discord.com/invite/rURmwrzUcz in the #dev-blog channel

Describe the issue

• What happened? [e.g. crashed, texture is broken] it broke my modpack
• What were you doing when it happened? [e.g. loading the game, playing multiplayer, single-player] laoding the game

Screenshots

• If applicable, add screenshots to help explain your problem.

Crash log

• If the issue is a crash you must provide a crash log or nothing can be done.
• If it is not a crash your latest.log is always helpful to diagnose potential issues.
• https://minecraft.fandom.com/wiki/Tutorials/How_to_get_a_crash_report
  launcher_log.txt

Your setup: (please complete the following information):

• Minecraft version: [e.g. 1.19.2] 1.20.1
• ModLoader: [e.g forge/fabric] forge 47.1.0
• ETF Version [e.g. 4.0.1] 4.4.5
• Does the issue persist with only ETF installed?
• Have you checked the FAQ in the Readme, or Discord, to see if it is a known issue?
  latest.log
  crash-2023-07-23_20.57.04-client.txt

It didn't happen before so maybe it's a mod incompatibility

resolved in version 4.5.0