Describe the bug
As of v3.6.0 the harvest level property has been replaced by harvest tier. This causes any world to be unlaunchable with ElementalCraft and SilentGear.

To Reproduce
Steps to reproduce the behavior:

1. Install ElementalCraft (6.0.1 as latest published on CF, but should remain an issue on latest in GH releases) and SilentGear (3.6.0+).
2. Create or open any world.
3. Error due to harvest_tier property missing

Caused by: net.silentchaos512.gear.gear.MaterialJsonException: Error loading "elementalcraft:air_silk" from pack "elementalcraft-1.20.1-6.0.1.jar": Missing harvest_tier, expected to find a string

Expected behavior
The normal behaviour would be the world to load correctly with the materials for SilentGear loading correctly.

ModPack
None in particular, but can be replicated in ATM9 but adding ElementalCraft as additional mod.

Fix
On the data generated files for SilentGear, harvest_level from the stats (and additionally tips, and other) should be removed and add a "harvest_tier": "minecraft:level_here" to the root of the material configuration file (same level as type and simple properties).