After switching to 6.0.2, any page that contained a grid cell with a hlayout container stopped rendering properly. After taking the hlayout out and leaving just the label inside the cell, it rendered correctly.

In other words, this no longer works:

<cell>
<hlayout sclass="right" width="100%">
<label value="@load(vm.selectedCreditMemoLocationBatchItem.batchNumber, after='initializeModel')" />
</hlayout>
</cell>

But, this does:

<cell>
<label value="@load(vm.selectedCreditMemoLocationBatchItem.batchNumber, after='initializeModel')" />
</cell>