***
If you're not sure this is actually a bug or valid feature request, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports

Please remove this comment after reading and before submitting - thanks!
***

DESCRIPTION
XML tags are not saved correctly in the Tellico database when they contain emoticons.

STEPS TO REPRODUCE
1. Create a field (of the ‘Checkbox’ or ‘Choice’ type, for content filtering) whose title contains an emoticon
2. Then, in at least one record in the database, fill in one of these fields, and save the database.

OBSERVED RESULT
The next time Tellico is launched, it no longer loads either the emoticons or the accented characters (I am French).

The next time Tellico starts up, neither the emoticons nor the accented characters appear (I'm French).

However, editing the same file (before saving it in Tellico) in Kate shows that they are still there.

But if you save this database with Tellico, it physically removes all the emoticons and accented characters from the database.

ADDITIONAL INFORMATION

Workaround: 
The solution to repair the database was to remove the tags “️-rss-on-vivaldi” and “-reading-frequency” from the entries.

Next, to create fields with emoticons on Tellico:
First create the field without the emoticon, then assign it to at least one entry in the database. Save the database with Tellico. Then edit that field and add the emoticon.