Hey Chris,
As you break individual events from the series, the new single events will no longer have tickets associated with them. You would need to add the tickets to those new single events.
I did test the idea of reusing the SKU to see if it would use that same ticket, however it will still create a second WooCommerce product with the same SKUÂ https://cloudup.com/cSHuLHFnu0E.
Let me know if this helps.
Thanks!