Latest 1.16 test build re-adds Notification bug (Toast messages)

**Describe the bug**
The latest build for fabric 1.16.4 (From around 6th december 2020) re-added the Weird Toast messages on startup (Blue toasts showing squares instead of letters)
This was fixed/didn't show up in the previous build.

**To Reproduce**
Steps to reproduce the behavior:
1. Use latest 1.16.4 deployment of 5zig
2. Start the fabric profile in MC launcher
3. Observe the issue in loading screen

**Expected behavior**
The toast messages shouldn't show until everything has been fully loaded.

**Screenshots**

**Desktop (please complete the following information):**
- OS: Windows 10
- Version b245 (Fabric 1.16.4 build from 6th december)
- If built from source: N/A

**Additional context**

Look for toast notification handling in the codebase, likely in UI or startup modules. The bug involves toast messages appearing prematurely during loading with incorrect glyphs. Start by searching for 'Toast' or 'Notification' classes, then examine the loading sequence to delay toast display until after resources are fully loaded. Test by running the fabric 1.16.4 profile and verifying toasts no longer show squares.

Rédigé par le modèle d'indexation à partir du texte de l'issue.