Customer portal transition - validators not applied

Summary

Regarding the new feature released in JSD Cloud where the customer now can transition issues from their portal. The customer's transition is not blocked by the transition's validator in the workflow.

Steps to reproduce problem:

Validator:
If a value for field Comment is not provided during the transition, show the following error: This field is required.

Set above validator to a workflow transition. Make transition accessable in customer portal. Transition issue from customer portal. Leave Comment field blank, and confirm transition.

Expected behaviour:

Error message: "This field is required." Transition not made.

Actual behaviour:

Transition successful. No error message.

Workaround

No current workaround for this issue.