Confirming on latest from a go install from yesterday and that it opens fine in MacOS Preview / pdf.js
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$ pdfcpu version
pdfcpu: v0.11.0 dev
commit: ? (?)
base : go1.25.0
config: /Users/kilgore/Library/Application Support/pdfcpu/config.yml
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$ pdfcpu validate [snip].pdf
validating(mode=relaxed) [snip].pdf ...
validation error (obj#:11): dict=formFieldDict required entry=Rect missing