Cannot save to Zotero from Nuclear Fusion using connector in Vivaldi

Hello,

by some reason Zotero + Vivaldi + Nuclear Fusion papers don't go together.

When I hit 'Save to Zotero', a small window appears saying 'Saving to My library', but nothing happens. There is no confirmation that it's done, and no paper in the library.

It works fine in Chrome and fine, for example, with Fusion Engineering and Design (https://www.sciencedirect.com/journal/fusion-engineering-and-design)

My setup:
Zotero 7.0.10
Vivaldi 7.0.3495.18
Zotero Connector 5.0.150
Any paper from Nuclear Fusion (https://iopscience.iop.org/journal/0029-5515)
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