I've Magento 2.3 with MSI setup.

Please find below screenshot for sources setup.

Please find below screenshot for stocks:

I'm stuck where If i create downloadable product without assign sources I'm getting error like below:

How can I create downloadable product along with simple and configurable product ?

If I leave blank than getting error and If i assign sources to product than checkout displays shipping step and shipping method can't load due to its virtual/downloadable product. Cant able to complete payment.

Any ideas ? I ain't sure It is bug or I'm missing something ? Any help would be appreciated.