Cannot clean up locked type when importing application

Thanks for the response, Zubair - here are the steps which caused the error to occur:
1. Download [OPA_Supplier] CDT
2. Update XSD file to add new field
3. Navigate to designer interface and upload new version of [Supplier] CDT
- After upload, but during update, I was unexpectedly logged out of Appian.
- The CDT was not being uploaded by another user at the same time.
4. After logging back in, the [OPA_Supplier] CDT is no longer available in the list of CDTs.
5. In attempting to upload the XSD again, I received the following error message:
"A data type could not be updated because it or one of its dependents is currently being updated somewhere else in the system. Please try again later. Details: Invalid Type: Type Error: Cannot clean up locked type - {urn:com:appian:types:opa}OPA_Supplier"
- The CDT only has primitive data fields and no nested CDTs.

We have tried uploading through both /design and /designer portals, logging out and in, uploading with a different user, uploading it within an application, and even restarting the Appian server, but to no avail. It has been > 2 hours since this occurred, and we are running v16.2.

Thanks for the response, Zubair - here are the steps which caused the error to occur:
1. Download [OPA_Supplier] CDT
2. Update XSD file to add new field
3. Navigate to designer interface and upload new version of [Supplier] CDT
- After upload, but during update, I was unexpectedly logged out of Appian.
- The CDT was not being uploaded by another user at the same time.
4. After logging back in, the [OPA_Supplier] CDT is no longer available in the list of CDTs.
5. In attempting to upload the XSD again, I received the following error message:
"A data type could not be updated because it or one of its dependents is currently being updated somewhere else in the system. Please try again later. Details: Invalid Type: Type Error: Cannot clean up locked type - {urn:com:appian:types:opa}OPA_Supplier"
- The CDT only has primitive data fields and no nested CDTs.

We have tried uploading through both /design and /designer portals, logging out and in, uploading with a different user, uploading it within an application, and even restarting the Appian server, but to no avail. It has been > 2 hours since this occurred, and we are running v16.2.