Fill Form after adding pages

[JWinsen]

Hi Hopding,
I'm just facing some problems and I don't how to tackle them.
I have a pdf form which is filled via pdf-lib. Now I add an conditional form page at runtime. But I'm not able to fill those form fields from this additional page. The pdfDoc has the correct increased +1 page count but form.getFields() won't show those fields from the additional page.

1. I have already tried to re-initialise the form with pdfDoc.getForm() without success - those new fields are still missing.
2. When I'm using the complete form with additional site/fields already included, I'm able to fill'em up.
3. Now the curius thing, when I'm placing the same form fields in the main form and then adding the additional site it would be filled out without problems.

Any ideas what's wrong ?