From the title, after attuning to the Necklace of Prayer Beads, the spells that show up in the character's spells tab are indicated to have a casting time of 1 action.
The Necklace would read: "Each bead contains a spell that you can cast from it as a bonus action (using your spell save DC if a save is necessary)."

It's also adding Cure Wounds as a 1st level spell instead of 2nd as the item says. And it always has 6 charges even if it should have less (1d4+2).

It's almost certainly a limitation of the software that they just can't implement yet.