For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
See Announcement
We are still working on the Joomla update.
It's... the '{my-> id} doesn't work either.
'{$my->id}'
Element placeholders are not working but "static" placeholders are.
It's '{$my->id}'.
If you need a dropdown changing depending on the change of other elements use a dbjoin element with Data-where with element placeholders + ajax update enabled.