Here’s a doc that shows how to spawn the special items and their priority. If a condition is met that item will spawn the next round. If multiple conditions are met the item with the highest priority will spawn and the lower priority item/items will be put in queue and spawn accordingly the upcoming rounds.

There might be some inaccuracies but for speedrunning purposes it should be all good

https://docs.google.com/spreadsheets/d/1F5BWD8iI0ntSO2TnkwsrXSWIuCbAJyqNim9gxOcy4-o