We have a stack of three switches of the Summit X450-G2.
One failed and was replaced with the same one. Went through the usual process of replacing using enable stacking and assigning a number.
We have it listed as a standby along with slot 3. 1 being the master. However, slot 1 and 3 have internet access while slot 2 does not and is not receiving anything from the DHCP. Everything shows up fine with show stacking and stacking detail.
Slot 1 versions:
Again, slot 1 and 3 have internet connection. Slot 2 can see the computers along with the other nodes, but will not provide an IP or internet connectivity.