List of specs not supporting wildcards

I'm having an issue with the following command:
`$ SPEC="cypress\folder1\**\*.spec.ts, cypress\folder2\**\*.spec.ts" npx cypress run --env split=1,splitIndex1=1`

The command is not working as expected. It seems to skip all files, stating that no files were found. I'm not sure if I'm doing something wrong or if it's not supported to use wildcards in the list of specs.

Additional information:
- Cypress version: 12.10.0
- Cypress-Split version: 1.20.1
- Operating System: Windows 10 22H2

Any help would be appreciated.

Reproduce the reported `cypress run` command on Windows 10 with Cypress 12.10.0 and cypress-split 1.20.1, using the two comma-separated wildcard patterns. Trace how the plugin receives and resolves the spec list; done means matching spec files are found and split instead of being skipped.

Written by the indexing model from the issue text.