FIX: Net.extended_net returns first ExtendedNet object #1072

Job	Run time
Documentation Style Check	16s
Package library	17s
Tests and coverage (windows-latest, 3.8)	58s
Code style	37s
Tests and coverage (windows-latest, 3.9)	2m 0s
Tests and coverage (windows-latest, 3.10)	1m 15s
Tests and coverage (ubuntu-latest, 3.8)	27s
Tests and coverage (ubuntu-latest, 3.9)	22s
Tests and coverage (ubuntu-latest, 3.10)	26s
Doc build	4m 49s
Build and Smoke tests (windows-latest, 3.8)	1m 30s
Build and Smoke tests (windows-latest, 3.9)	2m 7s
Build and Smoke tests (windows-latest, 3.10)	1m 47s
Build and Smoke tests (ubuntu-latest, 3.8)	30s
Build and Smoke tests (ubuntu-latest, 3.9)	23s
Build and Smoke tests (ubuntu-latest, 3.10)	17s
Deploy development documentation	0s
Release project	0s
Deploy stable documentation	0s
	18m 1s

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