[Bug]: Flag Image URL not saving on world close/open

[nezumiku]

Bug Description

The flag blocks do not save the image / URL put into them when a world is closed and subsequently opened, it reverts to default flag of just having player head.

How to Reproduce?

1. Place Flag block
2. Enter URL for image
3. Image loads properly
4. Close world
5. Open world
6. See image not loaded anymore.

Expected Behavior

The image to properly save and load when world is closed and opened.

Version

1.15.2

Mod Loader Version

1.20.1 - 47.3.0

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.