Ok no problem. Try using one of the referral links in this thread: Referrals thread - claim a gift - #28 by Nina20
That has a chance to unlock I think. But otherwise it should just have a small chance to unlock whenever you check something off, or pull to clear completed items away.
Were you beta testing? (Those themes if purchased as a tester wouldn’t carry over.) But yeah I guess let me know if a future shop purchase does not seemingly go through, showing up in receipt etc.
You can also unlock some others though not from the pastel set this way: Redeem gifts in new Clear App - #3 by phillryu