Create a tracker field, of type Text or Text Area (possibly other types are also buggy).
Hit "Add field and edit advanced options", then check "multilingual".
Save the field.
Afterwards, get to tiki-view_tracker.php?trackerId=<number> and attempt to "Insert New Item":
All fields with option "multilingual" lack any input field. They can't be filled (even when mandatory). → Problem!
Going back to edit the field and removing "multilingual" option corrects the issue.
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