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BUG Svelte 5: bind:this sets to null if a store is used in #eachΒ #15698

@python273

Description

@python273

Describe the bug

{#each $windowsStore as w (w.id)}
<w.component bind:this={instances[w.id]} />
{/each}

Reproduction

With store, nulls in instances after adding a few windows:

https://svelte.dev/playground/hello-world?version=5.25.7#H4sIAAAAAAAAE3VTwa6bMBD8lX00UkCN4I4SpKf20FsPPfSQ5GDw0lh1bGQvoZXFv3cdCI9U7928uzPj2cGExIgrJmXyDbW2MFinJaQoFaHMkl3SKo0-KY8hob9dxMUG92fWa9fl_oaaYq8WHt_rN9YQGmKZZO8bpzqqTkZdO-sIAgxOkag1wgits1fYTrzCk3W4PZmTYb6PSN_XkV7jDvpOCoqUw8JPj-fsDT0oI-3gf0QRBoWTgRU_VpPE_SikLCENjWVPhp2OGRyqifPApbPgagCPS_Ku95c0KBbZbj8bHOBrZGT5Tegev7dptoOV9oPtkHpnHiJTd5qO7GqMu8whfXmQ54TyYunMKXNOGgkUry5Mg2wTNnxkFyFKbnjQYUPpArhH1famIWUNWPMq5c-7kTSL-51oHWDOAa3iKd8MRXF2ui-W78pF3RPdRRutmt-HsFIfKz7OK--LCXgnhU8omgtsnr6b8DBAOuRKZvGSIV8sQM24ki7KH8Ky0zEizyMUrBiKqDfy6yP8Q0lJrsdx98Er_j_N57f8znT9oqW6VXtPzppf1SX-RC8vHMdU74s4fTZx5kooHRdNylZoj-M_WJmeroUDAAA=

Using $state, no nulls in instances:

https://svelte.dev/playground/hello-world?version=5.25.7#H4sIAAAAAAAAE3VSwW7CMAz9FZMh0WqovVelEtoOu-2www6UQ0ncNVpIqsalm6L--xJgBSZ2Svye_ewXxzFd7ZFl7AWVMjCYTgmIUEhCEbMlq6VCy7KNY_TdhrwAePxctW7bxB5QUcB2lcV7ODeaUJOXYbnlnWypKLXct6YjeDL-1J6FujN7WCTphJwFFqVWSCC1pUpztLCCub8SRm6MT9wgtTCDfSPT4YXebD0993Utcoqmeg-Wuu41J2k0GL0W4v1YH8XgPEfXaknb2yZyUmSwWDxqHOA5SMfJoVI9vtZRvAT-O3B2cRMmG0udp5NfH-x6omNLriT_XLmr3mPhr2cfeXpKPBa5B6x4c-uwsjBANCRSxKHHkEwTwM7nZdRIu3KT4U3I3I6QekGXBrnRL4Xwi1hGXY_j8p_l_t3E7YrvsNeLFvJQ5JY6oz-KJvyt2cy_xinO08DeDrH1USVVMMqyulIWxx9JQ9q5nAIAAA==

Using store and bind:this={() => instances[w.id], (v) => instances[w.id] = v}, no nulls:

https://svelte.dev/playground/hello-world?version=5.25.7#H4sIAAAAAAAAE3VTwY6bMBD9lVkaKUaN4I6SSKvdQ2899NBDkoPBk8aqYyM8hFYW_94xEJZU2Zs9897zm2c7JFZeMSmSb2iMg841RoFApQlVmmySszbok-IQEvpbR1wscH1ivdZ15m9oKNZK6fFZvXKW0BLLJFtfNbqm_dHqa-0aggBdo0mWBqGHc-OusB55uSfX4Ppoj5b5PiJ9W0Z6iRtoayUpUnYzXxxO6Qe601a5zv-IIgwKRwsLftyNEsNSKlWACJVjT5ad9ins9iPnjhOT4KIB90OyuvUXETSLrNdfLXbwHhlpdpOmxe9nkW5goX1nN0htY-8iY3Xs9uyqj7NMIb3dyVNCWT5XppQ5J4MEmkeXtkK2CStesosQJVfcqLEiMQOGqM6trUg7C86-KvVzMCLSON-RlgFmHNAinuLDUBRnp9t8vlfelC3RIFoZXf3ehYV6v-flNPI2H4EDKXxBWV1g9XBv0kMHosu0SuMhXTZbgJJxBV203wUx3NY82SHiTxsQt2d1DubWQ85nhjye2PP7JPxDSUFNi_3mk3f-f96Pr_1Jd_nmlb7tt54aZ3_tL_GbvbxwYON-m8fuo4kT76Q2MYqkOEvjsf8Hy6qhmacDAAA=

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