The commit that introduces the colorization option added some problems.
First the "sectionFaceNumbers" property is only set when an execute is
performed. When this does not happen, an exception is thrown when the
document is saved that contains a fence created with an older version
of FreeCAD.
Also the new Props on the ViewProvider where not set because the
"onDocumentRestored" is not reckognized for ViewProviders.
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