From the Shopify Help Center:
Certain features are incompatible with product bundles. Review the following considerations:
- Bundles aren’t compatible with purchase options, which includes subscriptions, pre-orders, and try-before-you-buy.
- Bundles aren’t compatible with the Shopify Subscriptions app.
- Bundles can’t be used with Shopify POS to sell your products in person.
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So unfortunately it seems Shopify themselves don’t currently support bundles with pre-order apps. Hopefully this changes in the future.