6.2.X EE, Master
Steps to reproduce:
1. Create a new site "00 test import"
2. Add a public page to this site
3. Add a Calendar portlet to this page
4. Export the site and download the created lar file
5. Create another site "11 test import"
6. Import the lar file
7. Go to the Calendar portlet and see that the site Calendar is called "11 test import"
Therefore, all is well
8. Delete the 00 test import site
9. Create a new site "22 test import"
10. Import the lar file into this site
11. Go to the Calendar portlet
Result: The site calendar is called "00 test import" instead of 22 test import, new calendars cannot be renamed.
6.2.x - reproduced
master - reproduced