Preview throws fatal error when children present

TypeError: Drupal\book\ProxyClass\BookManager::bookSubtreeData(): Argument #1 ($link) must be of type array, null given, called in /var/www/html/docroot/modules/contrib/book/src/BookOutline.php on line 49 in Drupal\book\ProxyClass\BookManager->bookSubtreeData() (line 209 of modules/contrib/book/src/ProxyClass/BookManager.php).

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Issue created by @agentrickard
Comment 2 months ago →
🇺🇸United States agentrickard Georgia (US)
Also seems to occur in 3.0.x
Comment 2 months ago →
🇺🇸United States agentrickard Georgia (US)
Here's a patch. I will fire up a MR in a minute.

However, it looks like this path only treats the symptom. The real issue is that in a preview context, some of the expected variables seem to be missing.
Merge request !82Issue #3506840 by agentrickard: Preview throws fatal error when children present → (Open) created by agentrickard
Pipeline finished with Success
2 months ago
Total: 272s
#424650
Pipeline finished with Success
2 months ago
Total: 268s
#424652
Comment about 2 months ago →
🇺🇸United States agentrickard Georgia (US)
Oddly, I can no longer reproduce this on Drupal 11.1.3

Preview throws fatal error when children present

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!82Preview throws fatal error when children present
Open

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Preview throws fatal error when children present

Problem/Motivation

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User interface changes

API changes

Data model changes

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!82Preview throws fatal error when children presentOpen

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!82Preview throws fatal error when children present
Open