External link icon in high contrast dark theme appears as black

Is it an issue related to Adaptive Cards?

No.

What is the PWD impact?

External link icon in high contrast dark theme is not visible.

What browsers and screen readers do this issue affect?

Windows: Edge with Windows Narrator, Windows: Chrome with NVDA, Windows: Chrome/Firefox with JAWS, macOS: Safari with VoiceOver, iOS/iPadOS: Safari with VoiceOver, Android: Chrome with TalkBack

Are there any code-based customization done to Web Chat?

No, I am using Web Chat without any customizations except "styleOptions".

What version of Web Chat are you using?

Latest production

Which area does this issue affect?

Forced colors (high contrast mode)

What is the public URL for the website?

No response

How to reproduce the issue?

1. Turn on high contrast mode with dark theme (aquatic, or forced-color: active and prefers-color-scheme: dark)
2. Type markdown to MockBot

What do you expect?

The external link icon should be yellow (same as LinkText color).

What actually happened?

The external link icon appears to be black.

Do you have any screenshots or recordings to repro the issue?

Did you find any DOM elements that might have caused the issue?

No response

MAS reference

No response

WCAG reference

No response

WAI-ARIA reference

No response

Adaptive Card JSON

No response

Additional context

No response

Start by reproducing the issue in Web Chat with Windows high contrast dark mode, or forced-color: active with prefers-color-scheme: dark, then type markdown to MockBot. Inspect the external link icon styling and compare it with the LinkText color; done means the icon is visible and yellow in the reported forced-colors scenarios.