CrudManager allows a load operation to append records. But they are then syncable

[ExtAnimal]

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If in an before load event handler or callback, you set options.events = { append : true } the CrudManager will add the loaded events to the EventStore.

But the add operation adds the new records to the added Bag, and they are then synced to the server in the next sync call, and then receive new IDs. This should not happen. If they are loaded by the CrudManager, they should be loaded "clean". and not be synced.

AbstractCrudManagerMixin.js has this where you can see the append option being processed

        loadCrudStore(store, data, options) {
            const rows = data?.rows;

            if (options?.append || data?.append) {
                store.add(rows);
            }
            else {
                store.data = rows;
            }

            store.trigger('load', { data : rows });
        }

One (rather nasty) solution could be

        loadCrudStore(store, data, options) {
            const rows = data?.rows;

            if (options?.append || data?.append) {
                // Temporarily inject a transient added Bag so that these records are clean
                const { added } = store.added;
                store.added = { add(){} };
                store.add(rows);
                added && (store.added = added);
            }
            else {
                store.data = rows;
            }

            store.trigger('load', { data : rows });
        }

Perhaps there could be an option passed into Store.add to mean "addClean" which would tell the store to not add the incoming records to the added Bag