Svelte 5: on:click doesn't run (rare case, reproduction needed)

[98mux]

Describe the bug

I've haven't been able to successfully reproduce this in the repl or in a smaller project, it only happens in my main project. I'm mostly posting this here for visibility if anyone else experiences the same. Also I will post a successful reproduction once I've managed to figure it out. I'm pretty sure this is a Svelte 5 issue, as it only started happening when going from Svelte 4 -> Svelte 5

In my project, if I have a button inside a portal to body then that button is not clickable, it seems like the on:click doesn't get properly set, as it is never runned when clicking it. This gets resolved if I use svelte:element this="button" instead of a button (thought it only works for on:click and not onclick when using svelte:element)

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAAA51V247TMBD9lVGElHRVpYLH0BYWKOKBm7TLE0HabDJtzTp2sJ2WquTfGdfObbsrLi9xEo_PzJk5Mz4Ga8ZRB8nXYyCyEoMkuKyqYBqYQ2U_9A65QfrWsla5_TPXuWKVAZ6JzSINjE6DZSpSw8pKKgOf6ZFxWCtZQhjP3GfsYMLnqZjP3Hl7Rsy9tcnUBg2h3cri4PHmt7UxUtjXlNacs_xucYwmsFjC0f1NTS6FlhxjLjdRuEWFT8PJ83ZzNrveMg0Cd6iA8DXkGedYABNQHqDMaK2U_I656Y-8qg0wA3up7rQ1NFsEhRV3Fk1j1-UJ15lYp1OgWEFIA_IMeT5zPE58iZXLRIIcSxSG4Jm2vB3XoGWb_CXdZyO68FYq0LK0EWdaiinUmokN3POpkEB2qE_cmNY1PpqRc75UvxHa0pbUlZFeSSilLNiaYREkRtXYTDtdOaO_kRbRNPjT6oHAao5jhR3BUG6g8RrrpWVtZhcXdoEL-KKzDSYwL9iO0oBJdXK_OIa51qAp-txIFTZLoJydGRUyry272AqyWTpID_yyylRWwvHd9Yf3K5eEBpA_vvtLG0VlaLzM4c2nD-C3rPPXV1dw5eNxIDO74M8T23UtcsNIVy60CPm0xVlAaMMLJ61AOP10eyvuZZHpg8h7kLoqMoORwP31yW7Sa6sD7TY7ZbE1RLZoct25XpBzRyscYLQoK044XQ5_1KgOLcPIWfSy9fDdOUIWNecjVOKxz6grbeGj4dH_c9j8m2-zVXJv0wIrpQjw5qOEtpfWshYFNY7Jt7bThtpKIA2eHB14kwY3D0ZglaOp_7owqBW1yURukz3Q0GNJNuNKebihbRf8NVXQERiSu_ki7oTct_pqC2zLncCTUR56jfg8wQsI7RpCAiN9DE81MVxyLvc0d62NTsDpBiIr_DZZE9sJA77xTY_RJ64Zi3XF46yqUBSvt4wX1Bq9JfJ4y4oCBeVonVFO_E6T-hula4kCKR55iAYZttUgAOpkiuSjLHCU_dFOrLCUOzwPoLnnz3feWIwKTa1ED-6Mpu2nD80jnc4092_Q_n0w-_44YeClrQWN0gfG1PkM6udKN3PObvL7E9TrHlwV3I2uOV2Rs9ONQeYPXhffmt9UA61UkggAAA==

Logs

No response

System Info

System:
    OS: Linux 5.18 Manjaro Linux
    CPU: (12) x64 AMD Ryzen 5 5600U with Radeon Graphics
    Memory: 556.61 MB / 7.08 GB
    Container: Yes
    Shell: 5.2.15 - /bin/bash
  Binaries:
    Node: 21.1.0 - /usr/bin/node
    Yarn: 1.22.19 - /usr/bin/yarn
    npm: 10.2.3 - /usr/bin/npm
    bun: 0.8.1 - /usr/bin/bun
  Browsers:
    Chromium: 119.0.6045.123

Severity

annoyance

[Prinzhorn]

May be related to #9777 ?

[98mux]

@Prinzhorn Yes, most likely

[98mux]

Fixed by: #10060