[PowerPoint] Shape fill color cannot be retrieved for theme colors

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🎈 Environment

• Platform: PC desktop
• Host: PowerPoint
• Office version: 2511 Build 16.0.19426.20218) 64-bit
• Operating System: Windows 10, Version 22H2

🎈 Current & expected behavior

I insert an SVG in the slide via

Office.context.document.setSelectedDataAsync(preparedSvg, { coercionType: Office.CoercionType.XmlSvg });

Later on, I retrieve the shape fill color of that shape via

shape.fill.load(["foregroundColor"]);
await context.sync();
const color = shape.fill.foregroundColor;

I get a sensible color only I use a color from the "Standard Colors" in the color picker. Select any shade or theme color and the color will be #000000. Expected: the foreground color should hold the correct color.

🎈 Reproduction

You can find the reproduction via Script Lab here. To follow it, do the following:

• Click on Run, this will insert a predefined SVG into the slide.
• As expected, the fill color is null at this point (see the console).
• Now go to Graphics Format -> Graphics Fill and choose a color under the heading "Standard Colors".
• Then, click away from the object, then click again on the object. The log should show the correct fill color as hex string.
• Now, repeat this with a color under the heading "Theme Colors". The log will display the color #000000.

powerpoint-shape-fill.mp4

🎈 Context

The context is this repo where I am currently working on an Add-in for PowerPoint that lets the user insert typst formulas. I'd like to detect the shape color even if the user changes it manually, such that I can reuse this color when the user updates the content of a formula.

[github-actions]

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[github-actions]

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[Splines]

I can confirm that this issue is indeed related. If I specify a custom color, the value is correctly retrieved. It just doesn't work with any theme color.