measure in x axis affects proportions in y axis - change from dimple 2.1.6 to 2.2

[simbs]

I have a mekko chart that shows cost changes based on known future cost changes from 3rd party partners. I am plotting both cost increases and decreases in the same mekko, with the following rules:

• CRM Teams go on x axis, sized on percentage of positive cost values only (ie cost increases)
• each x axis category is divided vertically by customer, sized by absolute value of cost
• cost increases are red, decreases are green (yes, the chart does look like Christmas)
• in each x axis category, cost increases are at the bottom, decreases at the top

Data points look like this: {absCost: , cost: , crmTeam: , customer: , order: , sign: }, where:

• absCost is |cost|
• order is 0 if cost is negative, cost otherwise
• sign is "positive" or "negative".

And this axis & series definition

// set x axis, group by crmTeam and order by "order"
var x = myChart.addAxis("x", "crmTeam", "order");
x.addOrderRule("order", true);

// set y axis, remove gridlines, hide it
var y = myChart.addPctAxis("y", "absCost");
y.showGridlines = false;
y.hidden = true;

// add series, aggregate by customer/sign combinations
// colour by sign
var s = myChart.addSeries(["customer", "sign"], dimple.plot.bar);

// make negative bars always be on the bottom
s.addOrderRule(function (left, right) {
    if (left.sign === right.sign) return 0;
    if (left.sign === "negative" && right.sign === "positive") return 1;
    return -1;
});
// order by cost in descending order
s.addOrderRule("cost", true);

This was working fine until I updated to dimple 2.2, at which it starting giving every reactangle with order=0 a height of zero.

Changing things in the y-axis properties did nothing to change it, but removing "order" as a measure for the x axis started displaying them again, although not in the way I want it to (the x axis is no longer sized and ordered by sum of cost increases).

Any idea what's causing this? And if this was a necessary change in v2.2, do you have suggestions on how to change the chart? I'll have to keep using 2.1 otherwise, should be fine.