message: prevent invalidation of basecard in store
diff: @@ -839,6 +839,8 @@ function reifyCard(card) {
  }
  async function invalidate(cardId, latestVersion) {
  + if (cardId === baseCard) { return; } // don't invalidate the base card--it never changes, and everything descends from it
  +
  for (let format of ['isolated', 'embedded']) {
  for (let [id, entry] of store[format].entries()) {
  let card = await entry;
  