Currently, when you are possessing a Giant, you are normally unable to break, place, or use blocks*, even though you do have full armor and inventory and are capable of picking up items, crafting, and dropping items. This is because the server's built-in anti cheat system prevents any block breaking, placing, or usage actions that are outside a 6 (or 8) block radius sphere centered on the entity's feet, while the client-side range is 4-5 blocks centered at eye level.

To reproduce:

1. Possess a Giant
2. Go to and/or /fill a relatively tall structure
3. Attempt to place blocks on or mine blocks from the structure.
4. The block actions that you are attempting to perform will be reverted.

The fix could involve any one or more of:

• Increasing the max allowed reach server-side for Giants and similar large entities
• Increasing the max reach client-side for Giants and similar large entities
• Moving the sphere used to check server-side that the block action is allowed to being centered at eye level
• Warning that Giants are incapable of building properly

Minecraft 1.16.4
Requiem 1.4.4
Pandemonium 1.4.4
Fabric API 0.29.3
Fabric loader 0.11.0