fix/preprocess-schema-dict-mutation - Branch - PrefectHQ/prefect

fix: prevent dictionary mutation during iteration in preprocess_schema

#19946Merged

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fix: prevent dictionary mutation during iteration in preprocess_schema When processing schema definitions with block_type_slug where the definition's title differs from the dict key, the code would add a new key to the definitions dict while iterating over it, causing: RuntimeError: dictionary changed size during iteration This fix iterates over a snapshot of the dict values using list() to allow safe modification during iteration. Fixes #19935 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

184c34b

1 day ago

by zzstoatzz

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