TypeError: Cannot assign to read only property '__fragments' during SSR with SolidStart

[dahlia]

Description

When using solid-relay with SolidStart, navigating to certain pages causes the Vite dev server to crash with a TypeError: Cannot assign to read only property '__fragments' error. This occurs during server-side rendering.

Environment

• solid-relay: 1.0.0-beta.15
• solid-js: 1.9.9
• relay-runtime: 19.0.0
• @solidjs/start: 1.1.7
• Runtime: Deno (via Vite)

Error

error: Uncaught TypeError: Cannot assign to read only property '__fragments' of object '#<Object>'
    at setProperty (file:///node_modules/.deno/solid-js@1.9.9/node_modules/solid-js/store/dist/server.js:12:26)
    at file:///node_modules/.deno/solid-js@1.9.9/node_modules/solid-js/store/dist/server.js:97:7
    at updatePath (file:///node_modules/.deno/solid-js@1.9.9/node_modules/solid-js/store/dist/server.js:70:13)
    at setStore (file:///node_modules/.deno/solid-js@1.9.9/node_modules/solid-js/store/dist/server.js:81:66)
    at file:///node_modules/.deno/solid-relay@1.0.0-beta.15/node_modules/solid-relay/dist/index.js:237:6
    at batch (file:///node_modules/.deno/solid-js@1.9.9/node_modules/solid-js/dist/server.js:103:10)
    at Object.next (file:///node_modules/.deno/solid-relay@1.0.0-beta.15/node_modules/solid-relay/dist/index.js:233:4)
    at Object.next (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/network/RelayObservable.js:314:20)
    at file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/observeFragmentExperimental.js:66:12
    at RelayStoreSubscriptions._updateSubscription (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/RelayStoreSubscriptions.js:113:7)
    at file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/RelayStoreSubscriptions.js:73:26
    at Set.forEach (<anonymous>)
    at RelayStoreSubscriptions.updateSubscriptions (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/RelayStoreSubscriptions.js:72:25)
    at RelayModernStore.notify (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/RelayModernStore.js:227:30)
    at RelayPublishQueue.run (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/RelayPublishQueue.js:107:24)
    at Executor._runPublishQueue (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/OperationExecutor.js:981:61)
    at Executor._handleNext (file:///node_modules/.deno/relay-runtime@19.0.0/node_modules/relay-runtime/lib/store/OperationExecutor.js:367:30)
    ...

Steps to Reproduce

1. Clone the hackers-pub/hackerspub repository
2. Start the dev server in the web-next/ directory
3. Enter https://fosstodon.org/@nikoheikkila/114094340551556313 in the search box
4. The page redirects and the Vite SSR server crashes completely

Expected Behavior

The page should render without crashing the server.