Description
Generated diagrams does not include PlantUML metadata.

Reproduction
Steps to reproduce the behavior:

1. Write a PlantUML diagram script in a file named pumltest.puml
2. Refresh the PlantUM View to show diagram
3. Save diagram in PNG/SVG format or right click to export diagram in PNG/SVG format
4. Check the saved PNG/SVG diagram for metadata content (java -Dfile.encoding-UTF-8 -jar plantuml.jar -metadata -charset UTF-8 pumltest.png
   

Expected behavior
Expected the PlantUML script is embedded in the PNG/SVG diagram file.

Environment

• Windows: Windows 10
• Notepad++ version: 8.7.5 (64-bit)
• PlantUML Viewer: 1.8.0.12

Additional information
Using the plantuml-1.2024.8.jar (included in the PlantUML plugin) command line to generate PNG/SVG diagrams does contain metadata. However, the diagram exported from the PlantUML Viewer is missing the metadata.