Hi nbsx, I just got time to test out these changes 💚 Thank you for the fix! Looks like this eliminates the property bug.

this.registerEvent(this.app.vault.on('modify', tAbstractFile => {
    ...
    ...
    // If we add a new property to a file, refresh property icons
    this.editorIconManager?.refreshIcons();
}

Since this extra code only affects the properties box, can you cut this line out of IconicPlugin.ts and paste it into EditorIconManager.ts as its own callback? Just below active-leaf-change is a good position.

This also avoids a tiny merge conflict with #115, which is fixing some code at the same location in IconicPlugin.ts.