each blocks fails

### Describe the bug sometimes each block throws a "cannot read properties of undefined" error ### Reproduction https://svelte.dev/playground/hello-world?version=5.56.9#H4sIAAAAAAAACm2NwU6EQAyGX6WpF0gQRONlFjDevHjyuOxhFkqYONshM8WVTHh3g-vqxVOb7__-NiLrE6HCF7LWwdl520NCvRHqU8xwMJYCqn1EWabN2wBm19bzNOXhg6xs7KgD_cc7x0IsARVWofNmkqblViwJaO_1AjXsywzuM3g47Fquij-J4w3pbvzxdABi8cu61eN1jcWmbIyr4yziGBx31nTvdUxSqJvfL98zF_fmvFCfXMJXLWPuNffulKTQwF3-CE9wW4KCMl2bMM7DYKkqLqebljFDoU9BJX6m9ZChaGPPhntUg7aB1i9K4jhMVAEAAA ### Logs ```shell ``` ### System Info ```shell - ``` ### Severity annoyance