When creating a plan and a mapping step failed with an error then for all previous steps: clicking "next" button triggers nothing. Seems like all previous steps failed as well without an error displayed. 

Please see screen casts for reproducing.

2.9.0

Always

1.Run the plan creation wizard
2.Reach to the storage mappings steps for example
3.Generate an error in this step by removing all mappings rows.
4. Click "back" button and within the network mappings step,  click "next"
5. Click "back" to previous steps (vms, general) and in each step, click "next"

The "next" buttons for 4-5  triggers nothing without any validation error within the current step

The Next button should navigate to next step

Please see screencats