writeRuleFile() was missing the schematic file count integer before the schematic entries. The reader in readRuleFile() expected this count, causing a stream misalignment that led to an assertion failure (Unrecognised schematic version) when reloading a saved tutorial world.
The fix writes the count on save and adds backward-compatible reading that detects old saves (without count) via a peek heuristic and falls back to count-less parsing.
Co-authored-by: MCbabel <MCbabel@users.noreply.github.com>
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