Foundry crashing when trying to setFlag on items in an imported folder.

[thatlonelybugbear]

1. Import all content from a compendium.
2. Executing something like

   for (let i of game.folders.getName("name of folder").contents) {
   if (!i.flags["scope"]?.sourceId) await i.setFlag("scope","key","value")
   }

   Hundreds of thousands such callbacks are being registered for each item that is getting updated.

Without Compendium Browser module active, no such issue.