I have seen chatter about this issue but no acknowledgment of its status as either a bug or working-as-intended, nor does it have its own thread.
The description of Arcane Recovery says "recover a number of spell slots equal to half your level rounded up." That's in this game and in the SRD. In the SRD, you can take that in any combination of spell slots up to the total number you're allowed - so a 5th level character could recover a 3rd level slot, or a 2nd and 1st, or three 1st level ones.
In this game, you only recover one spell slot, and it's the highest single slot you can recover. There have been multiple times where I have specifically wanted to recover 1st level slots, and am allowed to by the SRD and should be according to the ability description, but after 3rd level the game will only let me recover spell slots over 1st level.
I am assuming this is a bug or oversight, because it's not indicated anywhere as an intentional change from 5e RAW (and if it's an intentional change it's a bad one).