SvelteKit hydration fails with "500: Internal Error" on Chrome 146 / Android 14

[anthonybailey]

(This may be unique to Anthony but I did try hard to remove state and reproduce cleanly. Noticed first yesterday, I think. Dumping what I know.)

SSR content renders correctly then gets replaced by "500: Internal Error" during client-side hydration. Affects all pages (tested /, /about). The nav/shell remains; only page content is replaced with the error.

Environment:

Chrome 146.0.7680.164 (stable, no modified flags)
Android 14, Pixel 5 (Build/UP1A.231105.001.B2)
V8 14.6.202.26

Confirmed not the cause:

• Cookies / localStorage / site data (reproduced after full clear + phone restart)
• Network issues (HTTP responses are all 200, verified via chrome://net-export/ capture)
• Chrome flags (none set, reproduced after flag reset)

Works fine in:

• Firefox on the same device
• Chrome on other machines

What I could not obtain:

The actual JS console error. Android Chrome has no local DevTools, the #enable-logging-js-console-messages flag produced no output in a bug report logcat dump, and I lacked a USB data cable for remote debugging. Wireless ADB is the next step.

Next steps for anyone reproducing:

If you have Chrome 146 on Android, check if you see the same hydration failure

Remote DevTools (chrome://inspect) would immediately reveal the JS error causing the SvelteKit error boundary to trigger

[Wituareard]

Did this ever happen again?

[anthonybailey]

It survived device reboots, clearing all local storage, and a few different deploys to main.

...and is not reproducible today.

I do appear to have Chrome 146.0.7680.177 now though.

Issue goes into the archive.