[Bug] Unable to update feed for niconico channels

[shati89406]

Checklist (Your issue will be automatically closed if you delete this part)

• I make sure that there are no existing issues - open or closed - which I could contribute my information to.
• I understand that issues with limited impact, such as those occurring on specific devices or under specific network conditions, will not be fixed.
• I am able to reproduce the bug with the latest version given here: CLICK THIS LINK.
• I have attached the error report in the issue.

Describe the bug
Feeds for niconico channels cannot be updated.
Every time I try to refresh the feed of a subscribed Nicovideo channel, it fails.

This is not due to an IP ban — I tested it across multiple network connections (all using regular, non-VPN Japanese IP addresses), and the issue persists.
Family and friends are experiencing the same problem, so I believe this is a widespread issue.

Frequency
Every time (100%)

Steps to reproduce the bug

1. Subscribe to a Nicovideo channel
2. Try updating its feed
3. Update fails consistently

Device (e.g. Pixel 9 Pro)

Error report

Additional context
This affects all Nicovideo feeds I have tested.

[github-actions]

🔍 Found related issues:

• [NicoNico] No Trending Video for Oversea Users #546
• I am unable to watch NicoNico videos on my device. #272
• v4.5.0 #1144

Please check these issues first before proceeding.

[InfinityLoop1308]

Fixed in 4.6.0.