CustomVocab / ValueSuggest and CSVImport

I created a new Custom Vocab and I set the controlled vocabulary terms to a list of entered terms.

I have chosen the Custom vocab created earlier as the data type for one of the properties in my resource template.

This property is filled in my CVS file with values that appear in my custom vocab and others that do not.

When mapping, for the property in question, I click on the wrench symbol button for spreadsheet column options and I have chosen the Custom vocab created earlier as the data type.

When importing, I expected that items for which the property contained values that did not exist in the Custom Vocab would be rejected or at least the value would be ignored.

However, these items were indeed imported with the values of the property that are not in the Custom Vocab.

I have the same problem with ValueSuggest.

Is this normal?

We are using Omeka S version 3.2.0 and the version for the installed modules is as follows:
• Custom Vocab : version 1.6.0
• Value Suggest : version 1.11.0
• CSV Import : version 2.3.1