Jigsaw blocks do not generate the correct structure until "Done" is pressed and the UI is reopened

The bug

If you change the fields of a jigsaw block, it will not generate the correct structure until "Done" is pressed and the UI is reopened.

A video is attached. The first and second jigsaw blocks generate the correct structures. The third one's fields are changed, then "Generate" is pressed, but the structure pertaining to the old fields are generated instead. The fourth jigsaw block's fields are changed and generate correctly after "Done" is pressed and the block is reopened.

The presets of the jigsaw blocks I used are also attached for reproduction purposes.