message: Set collabStarted flag on content load
diff: @@ -401,6 +401,7 @@ export abstract class SharedSegmentSequence<T extends MergeTree.ISegment> extend
  const loader = new MergeTree.SnapshotLoader(this.runtime, this.client);
  try {
  const msgs = await loader.initialize(branchId, storage);
  + this.collabStarted = true;
  msgs.forEach((m) => this.processContent(m));
  this.loadFinished();
  } catch (error) {
  