The behavior of disconnecting child cores for C2000 multi-core environments has changed in recent versions.

For example, see the below scenario on a F28379D:

CCS 10.4:
-manually connect to CPU1
-manually connect to CPU2
-manually disconnect to CPU2
-manually disconnect to CPU1

CCS 11.2+:
-manually connect to CPU1
-manually connect to CPU2
-manually disconnect to CPU2
-CPU1 is auto-disconnected

Note that in BOTH versions, connecting to CPU2 first with auto-connect CPU1 and disconnecting CPU2 will then auto-disconnect CPU1.

The expectation is the behavior that was exhibited in CCS 10.4.