If you select a mixed symbol instance set and then apply a reflection with the Reflect tool, the only symbol instances that will be reflected are those that are linked to the selected symbol in the Symbols panel.

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Quizplus · Accepted Answer

When you select a mixed symbol instance set and apply a reflection with the Reflect tool, all the selected symbol instances will be reflected, not just those linked to a specific symbol in the Symbols panel. The Reflect tool applies transformations to the selected objects as a whole, regardless of their link to symbols.

If You Select a Mixed Symbol Instance Set and Then