Divergent behavior on deriveds in the playground#15831

### Describe the bug When doing a simple test involving deriveds declared in the constructor of a class, I saw that the playground did not perform the expected behavior, the derived instance simply did not work. However, the same code executed locally works normally. The generated code also appears to be the same. ### Reproduction [REPL](https://svelte.dev/playground/hello-world?version=5.28.2#H4sIAAAAAAAACnVSy07DMBD8ldXCIYGQIo5RWwnBgX_AHFJnCwZ3HdkbCor87yhx2tJS5EOs8c7D4_TI9Yawwiey1sHWedtARo0RanIscG0sBayee5TvdpgbACx2rPu2LcMnWRmwVR3oHK4dC7EErHAetDetLBUrMZvWeYH-wXUs5At4dN3KUoS1dxtQWM6C1EJhEirfg0LFA1M7DgI68WABTFuYVLL8MNCMetN5Es8mUq54Pjtk4fmqE3EMjrU1-mPRZzksljuLUnfeE8v1dRyT9yd4hBvok9seGgySaDJIl6hcK8ZxAN8xhdlSMRYo9CVYie8oFv_0fNrEcdtnTn91Tl9jz9rWIexqgn6sKWWFBVyOEtltrjgOcY84qbpEuUjX3JfsOy3O72tNQ38e4LIhbz6pyU6Kgyu4yxND3kwoL_aMSUfJKwlM01l-gJV4ks4zHPIMK6bN-InpZzkrMJF_mw6ZiGVixuN3eSlQamO3hhus1rUNFH8AsS1M0joDAAA=) ### System Info ```shell running Svelte compiler version 5.28.2 ``` ### Severity annoyance