Source Group membership is not mapping if we migrate the user accounts to different child domains within the same forest.

Hi Team

We migrated the user accounts between child domains within the same forest. The user was successfully migrated to the target domain, but they lost access to cross-functional source group memberships.

Please help me with the scenario's issue. How can we maintain the source groups even if we migrate the user accounts to different child domains within the same forest? I appreciate your response in advance.