Zotero connector fails to save spinger publication to library when using proxy

- Report id 1903963282 (but it’s probably empty? the config page says no errors logged).
- Zotero
- Zotero Connector add-on 5.0.91
- Firefox 91.0.2 x64
- Non-proxied link https://link.springer.com/chapter/10.1007/978-3-030-85665-6_37
- Proxied link, setup through connector and automatically redirected with scheme %h.recursos.biblioteca.upc.edu/%p (dot-to-hyphen conversion enabled):

When I click the « Save to Zotero » menu bar icon, the popup to change the default storage location appears, then nothing happens:
- no article is saved in the library
- nothing in connector debug log
- nothing in zotero debug log
- inspecting the connector from `about:debugging` I repeatedly see the following error:

Uncaught (in promise) TypeError: feeds is undefined
queryFeeds moz-extension://{extension id}/background.js:203 background.js:203:12
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