Problem/Motivation
Rolling back a book migration does not erase the records created in the "books" table, but does remove the values from the corresponding migrate_map table.
Steps to reproduce
Run a D7 to D10 migration using Migrate Tools.
Roll back the books data migration.
Proposed resolution
Rolling back the books migration would result in the "books" records being reverted.
Remaining tasks
Work out the cause of the bug.
Fix it.
User interface changes
n/a
API changes
TBD
Data model changes
TBD
Release notes snippet
TBD