v1.8 JEI Compatibility & Stability Fix

Fixes

• Fixed a crash with JEI when another mod was already registering the same item subtype.
• Improved compatibility with other mods using JEI by safely skipping duplicate registrations.
• Prevented rare client crashes caused by temporary invalid item data during gameplay.
• Cleaned up JEI integration to ensure a stable client startup and smooth initialization.

Notes

• This update improves client stability when JEI is installed.
• Recommended for modpacks using multiple JEI-related mods.