If you have an existing system and it is set up using LVM then deletion of one of the LVs from the list does not return that LVs space to the freespace so you cannot reuse it. For example, if you had an 8GB / but there was freespace in the VG so you wanted to make it a 13GB LV then you delete the 8GB one but the freespace reported by anaconda stays at the 5GB that it was before even though the old / LV is no longer listed.
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