Crash when using Expand Stroke on multiple curves each with multiple strokes

[qrunchmonkey]

1. Are you using the latest release version?: Yes, 1.9.2.1035
2. Can you reproduce it?: Yes

See attached demo.afdesign

There are 4 shapes 
- Curve A and Curve B have an 8pt white stroke and a 4pt black stroke.
- Curve X and Y only have a 4pt black stroke.

Expected behavior:
I should be able to select any combination of these shapes, chose Layer>Expand Stroke, and all the strokes will be expanded and the app will not crash.

Actual Behavior:

When I choose Layer>Expand Stroke the behavior depends on which shapes are selected:

• Selection contains only Curve X and Curve Y (and any number of shapes that only have a single stroke) - App behaves as expected.
• Selection contains ONE of curve A or curve B and ONE of Curve X or Curve Y - App behaves as expected.
• Selection contains BOTH Curve A and Curve B - App crashes 100% of the time.
• Selection contains ONE of Curve A or Curve B and BOTH Curve X and Curve Y - App crashes 100% of the time.
• The same behavior is seen in other documents when running Expand Stroke on a selection containing multiple shapes when some of them have multiple strokes.

demo.afdesign

[Affinity Info Bot]

The issue "Crash when expanding more than one 'multiple stroke' object" (REF: AFD-3892) has been fixed by the developers in internal build "2.2.0.1971".
This fix should soon be available as a customer beta and is planned for inclusion in the next customer release.
Customer beta builds are announced here and you can participate by following these instructions.
If you still experience this problem once you are using that build version (or later) please reply to this thread including @Serif Info Bot to notify us.