Purchase Invoice Line Discount not posting to AP account

My setup is not posting purchase invoices to AP properly, and I cannot find a suitable setting that affects this. I hope that someone will be able to suggest settings that I am overlooking. Here is the scenario, and why I think it is a setting.

Version: Current US Business Central (13.3) in US East 2 region (as of March 13, 2019)

1. Create a purchase invoice for any vendor and add a product to the purchase lines.
2. Select any quantity, then select a line discount amount (I am using 50% for my testing, but the error was found in production when using 100% discount).
3. Confirm that the line totals and invoice total are as they should be "IRL" - that is, if I have qty 1 of $100 item, I expect the Direct Cost to be $100, Line Amt. Excl. Tax to be $50, and the Total Incl. Tax to be $50 (non-taxable item, wholesale trade). Good so far...
4. Select Preview Posting and review entries. Expect that the AP account would show -$50 due. However, it shows the full amount due, -$100. Note that the Purchase Discounts account shows -$50, as I would expect.
5. Thinking that perhaps the reconcilation on payment-due calculations would sort this out, go ahead and post the purchase invoice. Nope, it shows the full amount due - which is not consistent with the information presented on the un-posted purchase invoice just prior to posting.

I tested this setup in stock Cronus company on the same tenant, and it works as expected, not as above (except Cronus includes tax calculations).

I have cross checked my implementation vs. Cronus in the following areas and see consistency between them:

- General Posting Setup: Inventory, Purchase, and Purchase Discount GL accounts are same function, but different numbers.
- Inventory, Purchase Discounts, and AP GL accounts are configured the same
- Vendor Posting Setup is the same
- Purchasing & Payables Setup -> Discount Posting is "All Discounts" and other settings are the same, except "Check Prepayments" (which I anticipate no effect)
- None of these setups have vendor- or item-specific discounts applied

Is there a setting I have missed somewhere?

Thank you in advance!