If the Site membership is removed from a user, the Team memberships from that Sites' teams are not removed.

Steps to reproduce:

1) Create a Site: Test Team Site
2) Create a Team in Site Memberships > View Team > Add Team as Test Team
3) Create a User : Team User
4) Assign User to Test Team Site as member
5) Assign User into Team Test Team under Test Team Site's Site Memberships > View Team
6) Remove Team User from Test Team Site either at User edit screen or Site Memberships screen
7) Check Team members (there's an empty list)
8) Reassign Team User to Test Team Site
9) Check Team members (Team User shows up there automatically)

Expected behavior: if User is removed from a Site, it's Team memberships in that Site must be removed as well as there's no guarantee that one he will be the member of that Site again or if he will be there's no reason to get the same Team membership and permissions automatically as well.