20th-level warlocks get the Eldritch Master feature, which lets them spend a minute asking their patron to regain expended spell slots (from the Pact Magic feature), and ends with this the statement:
Once you regain spell slots with this feature, you must finish a long rest before you can do so again.
I first interpreted this to mean that after using Eldritch Master, you have to take a long rest to regain spell slots the next time. Basically like there's a downside to using the ability.
Recently, I've wondered if I'm misinterpreting this and it means that you simply can only spend the 1 minute of "entreating your patron for aid" to regain expended spell slots once per long rest, but that spell slots are always regained on a short rest as normal (other than when using Eldritch Master of course).
Can any D&D legal scholars help me interpret this vague language?