Theme Developer: Migration Tools Incompatibility with MariaDB
MariaDB does not support certain XML format that concrete5 Migration Tool exports.
If you made your theme's sample contents using Migration Tools, you may face the problem from users. It's good to remember.
I was trying to make some demo with nipper15's theme.
I came across this problem because I use MariaDB locally.
I've already added as an issue to this GitHub.
Please speak out or help us solve the issue if you want Migration Tools data works for MariaDB.