Just reporting an issue with migration, it seems there is a problem with migration from 5.5 to 5.6 causing some inherited variable values to be lost and breaking blueprints.
This was an issue going from 5.4 to 5.4 but which had been fixed (see here: Some Inherited Blueprint Variables Breaks After Upgrade to UE 5.5 - #35 by Oil_in_Heat )
However it appears this issue has now reappeared for projects migrating from 5.5 to 5.6, with the same reproduction steps in the link above.
Unfortunate to see this still in 5.6.1 given that 5.7 Preview is already upon us, but it should be fixed as it will still affect those migrating projects forward to future versions/