When trying to build and upload a world, it'll often fail the first time silently as though you'd never asked it to build at all. It fails after having done everything bar the upload and just drops back to the normal Unity state with no popup errors and nothing in the SDK window itself to imply any problems.

The only indication of any issue are the following errors that remain in the console after the silently failed build. All subsequent builds will work fine, without issue. The issue is specifically with the first attempted build.

The errors in the console are attached as an image.