Hello,
It seems the issue you see is due to the BUG tracked in ID1349933 see https://cdn.f5.com/product/bugtracker/ID1349933.html
By default, the software installation process copies the configuration to the new boot location during the install, as described in K13438: Controlling configuration import when performing software upgrade/installation (https://my.f5.com/manage/s/article/K13438). If that is the case and no changes have been made since that installation was performed, it may not be necessary to install configuration, and the "Install Configuration" option can be set to "No".
Otherwise Workaround:
K14724: Using the cpcfg command to copy a configuration from one boot location to another
https://my.f5.com/manage/s/article/K14724
Thank you for posting. If you are able please let us know if this information helped you.