I'm using MD 2020. I was attempting to load a transaction into an Investment account to handlle non-security related fees. So I"m using Parent/Split. I was going crazy because the parent tx was being created with an amount of 0 and the default Category, that is, the split info was being lost. It took forever to figure out that I had to set the split.description for it to work (even if I set it to an empty string). Is this a bug?

                    s.setAccount(feeAccount);
                    s.setAmount(txnAmount, txnAmount);
                    s.negateAmount();
                    // above fails without a description
                    s.setDescription("");

The absolute only difference in the code between a working split and one that fails is the presence of the setDescription. If I comment that out that line, it doesn't work.
I haven't included the code that creates the parent and synchs it but I'm happy to include it if that helps diagnose the problem.