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• Your issue is based on the latest commit Yes
• State your OS and OS version Windows 11
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Because my native language is not English, the following content is generated by translation software. Please forgive me if there are any errors!

I used Adobe Acrobat to make a form filling test. I found that after filling the form with cli and opening it with SumatraPDF, Chinese garbled characters appeared.
At this time, open the file with Adobe Acrobat and save it again. Open it with SumatraPDF again and find that Chinese is displayed normally.
test-form.pdf
out.json
test-form-pdfcpu.pdf
test-form-acrobat.pdf