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There are quotation marks in the text - that might contribute?  But the text removed doesn't seem to have any relation to the position of the quotation marks.

Problem also occurs in Chrome on this mac - XML output contains full text where PDF does not.

Also, the problem occurs every time, I haven't checked to see if it is the exact same words being removed every time.  If you can't reproduce, I can do more digging.

Here is a link to the model: https://my.vertabelo.com/model/BHhd0oISb3h0yj70MW3dIBnWwHNdmUrk

I am trying to output it on a mac (macOS 10.13.5), using Firefox 60.0.2.  I can try other browsers, or other operating systems, if that would help.