I created a username/password credentials with the following command:
although this worked and the credentials also show up in jenkins, the credentials have the wrong type icon shown in the credentials list screen:
all four credentials shown in the above screenshot should have the same icon in the first position of each line - all should be of type "UserName with Password". Currently the ones from AWS Provider show a different icon with the tool tip "AWS Secrets Manager secret" (which in fact is the icon for "Secret text"). This is very irritating for a user.