There is no flipY (or negative scaleY) on a timeline item, so a mirrored copy of a layer cannot be produced on the timeline.
Setting scaleY: -1 on an item has no effect — it is silently ignored.
Steps to reproduce
1. Set scaleY: -1 on any layer
2. Render
Expected
The layer renders mirrored vertically.
Actual
No change. The mirrored copy has to be pre-rendered as a separate image asset instead.
Context
This came up building a reflective-floor / studio-void shot, where the reflection is just a flipped copy of each card at low opacity. A single-axis flip would make that a one-line change instead of a separate asset pipeline.
Environment
App version: 8.8.0
Platform: Windows 11 Pro 10.0.26200
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