Created attachment 151703 [details]
Template for mail merge with hidden text frame
Hidden text frames remain in output during mail merge.
Serge Krot committed a patch related to this issue.
It has been pushed to "master":
tdf#125522: Mail merge: Hidden text frames are not completely removed
It will be available in 6.3.0.
The patch should be included in the daily builds available at
https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.