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Some shapes don't exist on the thumbnail

Some shapes don’t exist on the thumbnail. Slides version 2.8.9.0
Sample attached.

All braces condensed to a line have TextFrame with empty text and
FitShapeToText property set to true. That is correct rendering.

But it is rendered fine in PowerPoint… May be there should be any exclusion for FitShapeToText property at shapes with empty text?