An image clip is fitted into a frame-aspect plate with no object-fit equivalent, so any source whose aspect differs from the project gets bars. The bars are painted opaque black rather than left transparent.
Steps to reproduce
1. Put a 1080×1080 image on a layer in a 1920×1080 project
2. Render
3. Sample the bar area either side of the image
Expected
Either a fit control (cover / contain), or bars that are transparent so the stage shows through.
Actual
Bars measure pure rgb(0,0,0). Against a themed stage of rgb(23,23,23) this reads as a rendering fault rather than as a card, and there is no way to change it.
Secondary point: image layers silently ignore shapeWidthPct / shapeHeightPct. Sizing has to go through scale. Ignoring them is defensible — doing it silently is what costs time, because the fields are accepted without complaint.
Context
We ended up generating purpose-built 16:9 assets to avoid the bars entirely.
Environment
App version: 8.8.0
Platform: Windows 11 Pro 10.0.26200
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