Root cause: widgets_values length mismatch between save and load.
The collapsible-header buttons had serialize=false set, so save emitted
a compact widgets_values of length 46 (the data widgets). At load, JS
re-adds the 4 buttons back to node.widgets, making it length 50.
ComfyUI loads positionally — the compact array's value at index 2
(image1_strength = 1.0) lands on the BUTTON1 widget (no harm), and
everything from index 3 onwards shifts by one position. Booleans land
on FLOAT widgets, numbers land in the imageN_ignore_area combo, and
ComfyUI's combo validation fires "not in list".
Fix:
1. Remove serialize=false from header buttons. They serialize as null
now. Save count = node.widgets count = 50, so positional load assigns
every value to the correct widget.
2. onConfigure migrates old compact-format saves: walks node.widgets,
inserts null at each header button position, consumes one value from
the compact array for every other widget. Result is a length-50
aligned array with values on the right slots.
The defensive null-strip from the previous fix is rolled into the
migration path (compact = info.widgets_values.filter(v => v !== null)).
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