"Add Payment Schedule" button missing in invoices?

[LHBakeShop]

I typically take a 50% deposit with 50% due at a later date. Today when I went to send an invoice, the "Add Payment Schedule" is completely missing from invoices for me. ACH is not checked as an option. There is no late fee. (I know these things can remove the schedule option). I have tried the new and old invoice layout. Am I missing something? Was this feature removed? Thanks for any and all assistance!