QTableView and QTreeView with Fixed vertical size policy and AdjustToContents sizeAdjustPolicy always reserve space for horizontal scroll bar

I suspect this is a regression from https://bugreports.qt.io/browse/QTBUG-69120

The UI file contains a QTableView and a QTreeview with a vertical size policy of Fixed and a sizeAdjustPolicy of AdjustToContents. In 5.12.11 this would result in a perfectly sized table to embed in a larger scroll area. Starting with 5.13.0 it began to always reserve space for the horizontal scroll bar, even when it is not shown.

The only workaround I've found is to set the horizontalScrollBarPolicy to ScrollBarAlwaysOff, but this is not appropriate in all cases.