When publishing custom resource changes to long-text attributes in the recent versions of ACS, the APIs are not being updated. The attribute is accessible through manual or workflow lookup in the UI, but not through the API. The reason for this was found to be a bug with the custom resource publication process that is not recognizing that the APIs need to be updated when changes are made to only long-text attributes.
CAMP-47983 has been opened to address this issue in a future release. In the meantime, here are a couple workarounds:
To confirm that the APIs are being updated, once the preparation is done, if changes are detected for
profileAndServicesExt, a tab labelled “Profile & Services Ext API preview” should be seen. If it is not present then no changes were recognized by the application.