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One line: Expectation: Not crash. Probably not valid in the prototype phase (inventory_size = "dynamic" is used by the blueprint book, but it is inherited from item-with-inventory)

Crashes:
1) /c game.player.insert("item-with-inventory") . 2x if new game.
2) open the item-with-inventory, there will be nothing but a label button
3) fast transfer initial items (furnace, burner, plates?). Close/escape and re-open, items are showing.

4a) fast transfer middle item. ctrl-click to fast transfer inventory. Crash:
4b) fast transfer last stack. Crash:

This is the initial inventory that can trigger both errors:

Thanks for the report. From looking into it the dynamic logic was only ever meant to apply to blueprint books so the rest of the handling logic isn't ready for it. For now I'm going to disable setting "dynamic" on not-blueprint-books.