%pagenumber% field not working on PDF export

[martincoster]

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Describe the bug
I am using %pagenumber% placeholder field on each of my drawing pages. This displays correctly in draw.io editor. However, when I Export to PDF, it seems only the currently viewed page number is used. For example, if I have 2 pages, and are viewing page 1 in the editor, when I export both @pagenumber% use "1". It should be the actual page number ("1" for 1st page, "2" for 2nd page).

To Reproduce
Steps to reproduce the behavior:

1. Add a Text to the drawing. Select the text.
2. Edit -> Edit Data
3. Add property called "page", click Add Property
4. Enter: "%pagenumber%" as the property value
5. Check the Placeholders check box, and click Apply.
6. Double click the Text, and type "%pagenumber%"
7. Duplicate this page to another page
8. View the pages in draw.io, and see it correctly show "1" text on page 1, and "2" text on page 2.
9. Select Page 1, and Export the drawing to PDF. See that both page 1 and 2 both show page number text as "1".
10. Select Page 2, and Export the drawing to PDF. See that both page 1 and 2 both show page number text as "2".

%pagenumber% placeholder field should display the actual page number of each page when exported to PDF, same as when viewed in the draw.io editor.

Version 29.6.6 desktop dmg version

Desktop (please complete the following information):

• MacOS

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: The %pagenumber% placeholder in exported PDFs always resolves to the page number of the currently viewed page in the editor, rather than resolving to each page's actual page number. This works correctly within the editor but not during PDF export.

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📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• Does this issue also occur when using the 'Print' option (e.g., Print to PDF) instead of 'Export as PDF'?
• Does the issue reproduce if you use %pagenumber% directly in the text label (without the custom property/Edit Data step), i.e., just enabling placeholders on the shape and typing %pagenumber%?
• Does this also happen when exporting to other formats (e.g., PNG with 'All Pages' selected), or is it specific to PDF export?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

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_{🤖 This is an automated response to help with initial triage. A human maintainer will review this issue. If you've provided all the requested information, no further action is needed - we'll get back to you soon!}

[jakejakejakejakejakejake]

Adding a note here that on Ubuntu using the .deb file of 29.6.6 and I see the same behavior. To respond to the bot, I was not able to try 'Print' option as that gives an error for "failed to enumerate printers". For the other formats, they do not allow multiple pages to be exported.

Does the issue reproduce if you use %pagenumber% directly in the text label (without the custom property/Edit Data step), i.e., just enabling placeholders on the shape and typing %pagenumber%? - Yes, I did not use any custom properties when I discovered originally.

[alderg]

This will be fixed in the next release (9887818b6).