Steps:
  • "Purchase" your own avatar listing on the Marketplace.
  • Go to Marketplace > My Store > Revenue on the VRChat website.
  • Select your own purchase.
  • Press "Void Purchase"
  • Return to or re-open VRChat.
  • The big menu > Marketplace > Purchases & Subscriptions > Subscriptions will have a red "New" badge on them without any items.
Does the "New" tag appear when you buy something and it is only persistent because I voided it before using the avatar? iirc this only appeared after I voided it but I may be misremembering.