Data API & text contains operator

I’m trying to get list with the constraint “text contains” by the Data API, but it’s not working.
When I’m using operator “equals”, everything is fine:
[ { “key”: “fieldxxxx”, “constraint_type”: “equals”, “value”: “bubble” }]
But when I change to the operator “text contains”, no records is returned:
[ { “key”: “fieldxxxx”, “constraint_type”: “text contains”, “value”: “bub” }]

Any tip?

Did you tried to use “contains” instead “text contains”?

I did. Not working either. Tks anyway