Website Migration is the most critical task. There are absolutely some consequences that make this quite messy sometimes.
Here are some more Website Migration are listed
1. Sometimes, there might be the possibility of data loss if you have not taken the backup of the website.
2. Also, chances for the loss of comments or other user activity during propagation time.
3. Sometimes, there might be files that take too much time to upload and download.
4. Sometimes, there are some Internal Server Errors due to the wrong file permissions set.
5. After the Website Migration process, there might be some configuration issues that need to face.
For successful Migration, always go with the best support team.
I would suggest you take advice from an expert before Website Migration.