When locking a multi-field component including a compositeField all the fields can be locked and than unlocked again, besides the compositeField.

Reproduce

• Go to https://author-integration-swissre-webpresence.de.magnolia-cloud.com/.magnolia/admincentral#app:pages-app:detail;/iptiq-us:edit
• Choose one of the hero teasers inside the hero area
• lock all the fields and save the dialog 
• open the dialog again and try to unlock all the fields again 

Expected result:

All the fields can be unlocked

Actual result:

All the fields beside the "compositeField" can be unlocked 

Please let me know in case you need further information.