This is happening to me as well, with the concatenation occurring when there is plenty of space to render. I figure it's a bug but doesn't look like it's been fixed with beta 4. To test you can put the test alone in a contentview and it will still occur
Brisket
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Here in the release notes for beta 4 the issue is referenced...but I've tried these work around and they did not work via TestFlight.
https://developer.apple.com/documentation/xcode-release-notes/xcode-12-beta-release-notes/?id=swift
Swift
Known Issues
Widgets may crash when built for release. (65862827) Workaround: Set DEADCODESTRIPPING to NO in the extension target’s build settings. When you upload the application to App Store Connect, also unset “Include bitcode for iOS content” in the App Store Connect distribution options.
Seeing this as well. I have it working with the updated APIs that dropped placeholder. It works locally but not via TestFlight. The build gets to TestFlight without errors though
Seeing this as well with the style timer. I should have more than enough width but it seems to add ellipsis. Wondering if it’s a bug too