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## Summary
- CSS logical border-radius properties (`border-start-start-radius`,
`border-start-end-radius`, `border-end-end-radius`,
`border-end-start-radius`) were being silently dropped when processed by
the CSS bundler
- The bug was in `src/css/properties/border_radius.zig` where
`VendorPrefix{}` (all fields false) was used instead of `VendorPrefix{
.none = true }` when computing prefixes for logical properties
- This caused the properties to be dropped by a later `isEmpty()` check
since an empty prefix struct was returned
## Test plan
- [x] Added regression test `test/regression/issue/25785.test.ts`
- [x] Verified test fails with system Bun (`USE_SYSTEM_BUN=1 bun test`)
- [x] Verified test passes with fixed bun-debug (`bun bd test`)
Fixes #25785
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
CSS
This is the code for Bun's CSS parser. This code is derived from the Lightning CSS (huge, huge thanks to Devon Govett and contributors) project and the Servo project.