Workflow No Longer Works on Memorized Transactions

This is so esoteric I doubt I'll get any posts, but here goes:

We use a workflow that on creation of an invoice sets the field value of two date fields through simple formulas. Since the last release, this workflow doesn't run properly when a memorized transaction automatically creates an invoice.

If I create an invoice in the normal way, the workflow executes correctly. If I manually generate an invoice from a memorized transaction, there is no problem.  But if I let Netsuite automatically create an invoice from a memorized transaction, as scheduled, neither field is set by the workflow and the workflow does not appear in the created invoice's Workflow History.