This issue occurs when SDDC Manager (SDDC-M) has been upgraded to version 9.0.0 or 9.0.1 and a domain is being upgraded to version 5.2.2.
Additionally, when the upgrade sequence is unavailable, calling GET /v1/bundles/domains/{domainID} via the Developer Center API Explorer returns an empty response.
SDDC Manager version: 9.0.0 or 9.0.1
Domain versions: earlier than 5.2.2
The vcfmanifest.json that SDDC manager is using contains patch bundle information for versions 5.2.1 and earlier, but not for 5.2.2.
Due to a bug in SDDC Manager 9.0.0/9.0.1, upgrade planning still depends on the patch bundle section of the vcfmanifest.json when performing ALL BOM straddle-state upgrade planning to version 5.2.2 or later.