derived value is not updating correctly #15829
Description
Describe the bug
the derived value depends on a class field of a newly created class.
when this derived value has a fallback value (like "v || '-'") it doesnt update correctly. removing the fallback seems to fix the issue.
Reproduction
https://svelte.dev/playground/dec1b43d47eb4c3aa729291f91ab8a39?version=5.28.2
Logs
System Info
System: OS: Windows 11 10.0.22631 CPU: (12) x64 AMD Ryzen 5 5600X 6-Core Processor Memory: 21.19 GB / 31.91 GB Binaries: Node: 22.12.0 - ~\AppData\Local\fnm_multishells\15692_1745479128899\node.EXE Yarn: 1.22.22 - ~\AppData\Local\fnm_multishells\15692_1745479128899\yarn.CMD npm: 11.3.0 - ~\AppData\Local\fnm_multishells\15692_1745479128899\npm.CMD pnpm: 10.7.0 - ~\AppData\Local\fnm_multishells\15692_1745479128899\pnpm.CMD Browsers: Edge: Chromium (133.0.3065.82) Internet Explorer: 11.0.22621.3527Severity
annoyance