Is your feature request related to a problem? Please describe.

Wildcard names only allow [a-zA-Z0-9_] and when an unsupported character is included in a wildcard name, it is silently ignored (get_wildcard_names returns an empty set). This can lead to confusing error messages like in issue #1349

Describe the solution you'd like
Issue a warning message, something along the lines of "there appears to be an unsupportedcharacter in what seems like a wildcard name. Wildcard names can only include alphanumeric characters and underscore"

Describe alternatives you've considered
Alternative is silently ignoring unsupported characters as it is now. This can cause confusion when troubleshooting a workflow

Additional context
Add any other context or screenshots about the feature request here.