Launchpad: Assertion failed: ManagedObject.apply: encountered unknown setting 'inboundPermanentKey'

Hi all!

The gateway system was upgraded from UI add-on 2 to FES 6.0. UI5 libraries are now of version 1.71.5.

Some custom apps started to produce this kind of error to browser console log upon startup:

abap.js:64 Assertion failed: ManagedObject.apply: encountered unknown setting
'inboundPermanentKey' for class
'sap.ushell.components.container.ApplicationContainer'
(value:'X-SAP-UI2-PAGE:X-SAP-UI2-CATALOGPAGE:SAP_HR_BC_MANAGER_T:8J4P99MBPQ3NPEOKDAQXMK6FX')

The apps work fine but I would like to get rid of this annoying error.

1. I have searched through the app source codes, there is no mention of "inboundPermanentKey" in them.
2. The catalog SAP_HR_BC_MANAGER_T contains both SAP standard apps and these custom apps but I can't see anything wrong in there. In the config of these apps (target mappings, tiles) there is no mention of setting called "inboundPermanentKey". Same goes for other catalogs/apps where this error comes up.
3. The catalog contains some apps which are configured "old style" in LPD_CUST and some newer apps which use simplified target mapping in Launchpad only.

Are there perhaps some new settings or configuration that needs to be done in the FES after upgrading to FES 6.0?

Thank you in advance for any advice!

br, Ossi