[Bug]: Changing items in item tasks does not update nbt

[Electrolyte220]

Bug Description

When replacing an item with nbt in an item task with a different item, the new item retains the nbt from the old item, so you have to remove the task and make a new one.

How to Reproduce?

1. Make a quest with an item task
2. For the item task, use any item with nbt
3. Try to replace with another item that either has no nbt or different nbt
4. Observe the item now has the nbt from the old item

Expected Behavior

The nbt is removed and replaced with the new item's nbt (if present).

Version

1.1.12

Mod Loader Version

1.20.1 - 47.2.17

Mod Loader

Forge

Logs or additional context

No response

Code of Conduct

• I have searched the issue tracker and confirmed that the issue has not been reported
• I have checked the FAQ (if one is present) and my issue is not listed
• I have verified that I am using the latest version of the mod
• I have verified that I have installed all the required dependencies for the mod
• I have verified that I do not have Optifine installed. We will close issues if we detect Optifine is in your pack. We cannot fix Optifine issues. Please do not report issues with Optifine present.