Pdf export of the meeting is missing most of the meeting information (almost empty)

To reproduce:

• install meeting application v 1.5.4 (I tested on XWiki 6.4.5 but could be unrelated to the base version)
• create a meeting -> fill in description and notes - see attached screenshot
• export the meeting as pdf
• Expected result: all the information in the meeting, including notes, description, participants, etc should be present in the exported pdf
• Actual result: only part of the fields are exported, notably description and notes seem to be missing -> see attached pdf