Duplicate self link in pystac 1.7.2

[TomAugspurger]

import pystac

item = pystac.read_file("https://planetarycomputer.microsoft.com/api/stac/v1/collections/sentinel-2-l2a/items/S2A_MSIL2A_20150704T101006_R022_T35XQA_20210411T133707")
links = item.get_links(rel="self")
print(len(links))

for link in links:
    print(link)

That will output

2
<Link rel=self target=https://planetarycomputer.microsoft.com/api/stac/v1/collections/sentinel-2-l2a/items/S2A_MSIL2A_20150704T101006_R022_T35XQA_20210411T133707>
<Link rel=self target=https://planetarycomputer.microsoft.com/api/stac/v1/collections/sentinel-2-l2a/items/S2A_MSIL2A_20150704T101006_R022_T35XQA_20210411T133707>

for pystac>=1.7.0. On 1.6.1 it outputs just the single self link. None of the other links are duplicated, just self.

[gadomski]

Closed by #1103