Hello,
is it intention that the premessage dissapears on validate?
In this example, just fill some value into the input and you should see the premessage dissapear after validation happened and input turns green.
https://snippet.dhtmlx.com/b73z95b5
Edit, by poking in the suite.js code, i just found out that setting successMessage and/or errorMessage helps me to workaround the issue.