Alexa does not understand Voiceflow's variable "contains" in IF

Alexa seems that does not understand Voiceflow’s variable “contains” in an IF statement.

For example, at Voiceflow simulator it understands
What car do you prefer?
IF car contains suzuki (say about Suzuki cars)

But at Alexa Test at Developer console it does not understand it. It just repeats the question.

Any ideas how to fix it?
I want to accept in the IF all the answers which include “suzuki”, like “i prefer suzuki”, “i like suzuki”, “i love suzuki cars”…