https://bugs.documentfoundation.org/show_bug.cgi?id=159895

            Bug ID: 159895
           Summary: FILESAVE PDF Tagged PDF export with Forms enabled
                    results in "Stack empty" error in PAC
           Product: LibreOffice
           Version: 7.5.0.3 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: implementationError
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]
            Blocks: 139007

Created attachment 192770
  --> https://bugs.documentfoundation.org/attachment.cgi?id=192770&action=edit
Example file from Writer

Attached example file contains two content controls (the bug does not happen
with only one). When this is exported as tagged PDF with the Create PDF Form
option enabled, PAC tools PDF/UA check will fail with the message "Stack
empty".

1. Open attached file (or attachment 186881 from bug 154984 to test with every
supported content controls)
2. Export as PDF, with the Tagged PDF and Create PDF forms options enabled.
3. Open the resulting PDF (or  attachment 186882 from bug 154984 ) in the PAC
2021 tool
-> "Stack empty" exception box appears early in the checking, indicating there
is some internal inconsistency in the exported PDF.
If the PDF/UA option is also enabled, or the Create PDF form option is not
enabled, this error does not happen.

Version: 24.8.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 8eee7eab8087590aa19bb9989c294e9be767f356
CPU threads: 15; OS: Windows 10.0 Build 19045; UI render: default; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: default

Seems to have started in 7.5 with:

https://git.libreoffice.org/core/+/6b2433f3b66c1f118dabcd40924122deb2d4f204

author  Miklos Vajna <[email protected]>    Wed Sep 14 08:35:28 2022 +0200
committer       Miklos Vajna <[email protected]>    Wed Sep 14 10:08:04
2022 +0200

sw content controls, dropdown: add PDF export


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=139007
[Bug 139007] [META] PDF accessibility
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