HUGE BUG with overbooking

To reproduce try to any product with Inventory 1. Open an incognito window and a product. At the same time try to create a new appointment in the backend. Now, select on both the same day and slot. Then, when both are selected, add the appointment to the cart as a customer. Now in admin, it should NOT be possible to book the same slot. But I can book it and create the appointment at the same time. Now we have 1 overbooked appointment. Instead of marking this slot as not available, it still shows as available and it says ‘1 slot left’, but when selecting it, it says ‘0 slots left’ (see attached image).

Reported here.

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