How does the new 5.5e Boon of Spell Recall work with Warlocks? /u/Earl_of_Ham DnD: Roll for Initiative!

I believe that there is a significant error in the new Boon of Spell Recall.

The boon’s prerequisites are: “Level 19+; Spellcasting or Pact Magic Feature”

It seems to be clear that Warlocks are supposed to be able to use it.

But the main benefit is worded as follows: “Whenever you cast a spell with a level 1-4 spell slot, roll 1d4. If the number you roll is the same as the slot’s level, the slot isn’t expended.”

However, lategame Warlocks ONLY have level 5 slots to cast with so they have no way of ever actually triggering the boon.

Am I missing something here or is this an error in the rules?

I believe that there is a significant error in the new Boon of Spell Recall.

The boon’s prerequisites are: “Level 19+; Spellcasting or Pact Magic Feature”

It seems to be clear that Warlocks are supposed to be able to use it.

But the main benefit is worded as follows: “Whenever you cast a spell with a level 1-4 spell slot, roll 1d4. If the number you roll is the same as the slot’s level, the slot isn’t expended.”

However, lategame Warlocks ONLY have level 5 slots to cast with so they have no way of ever actually triggering the boon.

Am I missing something here or is this an error in the rules?