The storage offload form component allows saving with partially filled fields (e.g. plugin set but secret/product empty). The partial config is silently dropped with no validation error.

MTV 2.11.0

Always 

1. Go to Storage Maps > Create storage map (form)
2. Select a vSphere source provider and the host target provider
3. Expand "Offload options (optional)" on a mapping row
4. Select "vSphere XCOPY" as the Offload plugin
5. Leave Storage secret and Storage product empty
6. Fill in the remaining required fields (name, source/target storage)
7. Click Create

The storage map is created successfully with no errors. However the CR
does not contain any offloadPlugin data — the user's plugin selection
was silently dropped.

Either:
- Show a validation error when only some offload fields are filled
  (e.g. "All offload fields are required when an offload plugin is selected"), or
- Warn the user that incomplete offload configuration will be ignored