electric-db-collection, sync breaks after change

Hi, I'm having an issue with this collection. The setup is a pretty barebones. In this scenario:

• There are A and B clients
• A makes a change, B gets the update
• A makes another (doesn't matter how many), B gets the update.
• But if B makes a change after A made a change, then changes are not reflected on the client A.
• This only happens with tanstack-db. If I use useShape from electric, it works normally.

My collection:

export const collectionsCollection = createCollection(
  electricCollectionOptions<Collection>({
    id: "collections",
    getKey: (row) => row.id,
    shapeOptions: {
      url: `${import.meta.env.VITE_API_URL}/api/sync/collections`,
      fetchClient: (input, init) =>
        fetch(input, {
          credentials: "include",
          ...init,
        }),
    },
    onInsert: async ({ transaction }) => {
      const { txId } = await ApiService.createCollection(
        transaction.mutations[0].modified
      );

      return { txid: txId };
    },
    onDelete: async ({ transaction }) => {
      const { txId } = await ApiService.deleteCollection(
        transaction.mutations[0].modified.id
      );

      return { txid: txId };
    },
    onUpdate: async ({ transaction }) => {
      const { txId } = await ApiService.updateCollection(
        transaction.mutations[0].modified
      );

      return { txid: txId };
    },
  })
);

Start by reproducing the two-client sequence using the shown createCollection and electricCollectionOptions configuration: make A change, let B receive it, then make B change and check A. Compare this TanStack DB path with the working useShape path; done means B's later change is reflected on client A.