TitledPane layout in GridPane broken on initial render

When my UI is initially rendered all of the TitledPanes only paint the title label and the expand/collapse triangle, without background or any other content, and all on top of each other. When I resize to force a layout everything is redrawn as it should be.

When only the title text is drawing, I can click on the expand/collaspe triang and watch it rotate open and closed, but still no content is painted.

The TitledPanes are contained in a GridPane, nested in another GridPane, as content of a Tab, in a VBox.

The another instance of the same UI panel behaves differently when shown in a different place in the app. In the failing case it is shown inside a SplitPane in my main application window, the working case is shown as the root done in a dialog.


I believe this was working in b114 and began to fail in b115.