PDF - Blank Entries in Bookmarks

[#1]

RH 2019.

When I create a PDF, the TOCis ok but the Bookmarks shows gaps. Please see the attached screenshot. 

If you click the bookmarks, they open the topics, ie the actual links work. 

Anyone know what's causing this? 

[#2]

RH 2019.

When I create a PDF, the TOCis ok but the Bookmarks shows gaps. Please see the attached screenshot. 

If you click the bookmarks, they open the topics, ie the actual links work. 

Anyone know what's causing this? 

[#3]

Please have a look at this thread, where this issue has already been discussed:

https://community.adobe.com/t5/RoboHelp/PDF-bookmark-hierarchy-is-incorrect-using-RoboHelp-2019/m-p/...

[#4]

Any idea when it will be fixed?

[#5]

Make sure you're running the latest version - fixes are coming out each release.