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Fedora 35, NetworkManager: ... conflict for address 192.168.178.9 detected with host 68:54:5A:FB:2A:7F on interface 'eth0'

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Whilst tinkering around, I noticed that NetworkManager complained about an IP conflict when I plugged the ethernet cable in. However, arp, nmap and eyeballing various files disagree. Can anyone help with what this message might otherwise mean?

$ nmap -sP 192.168.178.9/24
Nmap scan report for fritz.box (192.168.178.1)
Nmap scan report for Artemis.fritz.box (192.168.178.2)
Nmap scan report for athena.ariadne.lan (192.168.178.9)
Nmap scan report for GalaxyTabS.fritz.box (192.168.178.26)
Nmap scan report for iPhone-4S.fritz.box (192.168.178.34)
Nmap scan report for fritz.repeater (192.168.178.37)
Nmap done: 256 IP addresses (6 hosts up) scanned in 4.43 seconds
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