I found the culprit: kdeconnect.
As suggested here:
https://askubuntu.com/questions/897358/nautilus-freezes-on-copy-action-not-during-transfer
changing the name of kdeconnect-cli in /usr/bin works as a workaround.
** Also affects: kdeconnect (Ubuntu)
Importance: Undecided
Status: New
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Desktop Bugs, which is subscribed to nautilus in Ubuntu.
https://bugs.launchpad.net/bugs/1718443
Title:
Nautilus becomes unresponsive for several seconds when cutting or
copying a file
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https://bugs.launchpad.net/ubuntu/+source/kdeconnect/+bug/1718443/+subscriptions
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