A bit of a complicated edge case, but here goes: when I withdraw money from the underlying account without making a corresponding withdrawal from a savings goal, the "By Account" pie charts don't turn orange like the Spending Plan charts, instead they show the amount that's 'virtually overspent' as a gray wedge (ie leaving off the negative sign).
Example with numbers:
I have a monthly doctor's appointment with a $60 copay, which sometimes bills me several months at a time instead of immediately after the visit. The first time this happened after I switched to Simplifi this year, I set up a Savings Goal to use as a sinking fund, so that it wouldn't send me over my Spending Plan health category (yes, the gamification is working on me :P ).
Status as of December: create Savings Goal, contribute $300 from checking account, spend & withdraw $240, mark that check 'hide from Spending Plan', set monthly contributions to savings goal at $60 included in spending plan
Fast forward to March, I also have a FSA which I set up as a manual account since it doesn't offer a link option, and I've allocated $60 of it to the copay sinking fund. Say for ease of math it has $180 in it, so the $60 shows up as a purple wedge a third the way around. Now I finally get the reimbursement for my December check processed, and the $180 moves from my FSA account to my checking account, leaving the FSA with a $0 balance but $60 allocated to goals. Now it should have an orange overspent pie, but instead it's half gray and half purple, showing $60 allocated and $60 available to save. (Same thing happens with nonzero amounts: ie if it had $90 in the account and I allocated $120, it should be showing me an orange circle to indicate 1/3 overspent, but instead it appears 4/5 purple and 1/5 gray.)
(It would also be nice to have some way of moving allocated savings from one account to another as I move money between the underlying accounts, but I assume that should be a separate feature request?)