Translator for Institute of Physics (IOP) failing

Trying to get publications from IOP journals (J Phys B, Nuclear Fusion), the zotero pop-up just shows the selector for the collection, stays a while and then vanishes again without downloading any data.
Other journals/translators work as expected.
Tested with Firefox 60.5.2 (Windows) and 87.0 (Linux) with the exact same outcome.

The error log in the add-on settings says
[JavaScript Error: "Frame not found, or missing host permission" {file: "undefined"}]
I submitted a report with ID 1142045583.

Any suggestions would be much appreciated.
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