This affects every customer in the legacy Confluence editor.
If your app relies on AP.context.getContext() to fetch the content ID or content type of the current page, then your app has been broken for weeks.
I have multiple customers complaining about this breaking change, but Atlassian don’t seem to think it’s terribly important and downgraded the severity.
Can you please vote this up: https://jira.atlassian.com/browse/CONFCLOUD-79957