Cannot subscribe to Kernel Planet feed

[lottspot]

Describe the bug
My OPML import was freezing, which I eventually narrowed down to the Krnel Planet RSS feed (https://planet.kernel.org/rss20.xml). Removing this feed from my OPML file enabled a successful import, and attempts to re-add the feed individually after an OPML import also fail. All of these failures are silent, carrying no error message either in the GUI or via terminal output when I start the app from the CLI.

To Reproduce
Steps to reproduce the behavior:

1. Subscriptions > Add Subscription > https://planet.kernel.org/rss20.xml

Expected behavior
The feed and its content should appear in my subscriptions

Screenshots
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Desktop (please complete the following information):

• OS: Arch Linux
• Browser: Chrome and Firefox
• Version: 1.0.80

Smartphone (please complete the following information):
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Additional context
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