Svelte 5: Dismounting component breaks `$derived`s in `.svelte.js` files

[sockmaster27]

Describe the bug

When some global state using $derived is used in only one component and that component is dismounted, the $derived value stops reacting.

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACpWS3W6cMBCFX2XkVMqmQSBFyg2FlapKfYLclV7wY3bdsDayhw0I-d07YzaQ7UqRegOe8cznM8eeRas66UT6axa6PEmRiu99LyKBU8-BO8sOJcXODLbmTOZqq3rcF7pAdeqNRfhh6K-lRmitOUEh4mRNxQuhEN-ogVo6ieCO5g1y-OKwRLlDO8gH2s2Sjaxf7ASDro-yflX6AKVuYA3wKJegMmMMWWWp44Vy99M9nMtukA60gc7og7Qw9A0dspQtpXSS0v2AwCPmhXhHFQIqpZs0xLLJZ5bpIQkt851qg27PQ2TreLw7J6r1ZNHJNKpVshEpj-Sj1dG1-j99naE1JoKqtOA3aym3mvqPa1k1IBoNRtedql_zefcA-Z4p8fj46AN7TGEOCR_BdFlPnkFL82cgUnINCokLiNe3oEVpanpURjuwg6brSfaf2bUNuPn1x330qu5K5-CnMTAHJdtjeuaXVODEmUZadZbNDo_KxSN8hSfeJIVyDPbWJAjZHCrW8o15u9Cu-ZF-gIY-zl1hV-IVji8rX2QdmELGhaBAK3GwGsYg0Ef8daGC3uxaxKdSvNVcONMNZ1prPK1u_fzt_wLxUpeO3AMAAA==

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