Youtube response doesn't contain "onResponseReceivedActions" resulting in java.lang.NullPointerException

When attempting to fetchPage on a ChannelExtractor extractor, I get the following error:

java.lang.NullPointerException: Cannot invoke "com.grack.nanojson.JsonArray.getObject(int)" because the return value of "com.grack.nanojson.JsonObject.getArray(String)" is null
	at org.schabi.newpipe.extractor.services.youtube.YoutubeChannelHelper.getChannelResponse(YoutubeChannelHelper.java:154)
	at org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeChannelExtractor.onFetchPage(YoutubeChannelExtractor.java:92)
	at org.schabi.newpipe.extractor.Extractor.fetchPage(Extractor.java:60)

This is due to the response json not containing the "onResponseReceivedActions" needed by the YoutubeChannelHelper.

I've attempted to replicate the request using curl, but this results in the same issue: curl -X POST "https://www.youtube.com/youtubei/v1/browse?prettyPrint=false" -H "Origin: https://www.youtube.com" -H "Cookie: SOCS=CAE=" -H "X-YouTube-Client-Name: 1" -H "Referer: https://www.youtube.com" -H "X-YouTube-Client-Version: 2.20240502.00.00" -H "Accept-Language: en-GB, en;q=0.9" -H "Content-Type: application/json" --data '{"context":{"client":{"hl":"en-GB","gl":"GB","clientName":"WEB","clientVersion":"2.20240502.00.00","originalUrl":"https://www.youtube.com","platform":"DESKTOP","utcOffsetMinutes":0},"request":{"internalExperimentFlags":[],"useSsl":true},"user":{"lockedSafetyMode":false}},"browseId":"UCE1jXbVAGJQEORz9nZqb5bQ","params":"EgZ2aWRlb3PyBgQKAjoA"}'

This both happens when using my custom downloader implementation and using the DownloaderImpl of newpipe with the android stuff stripped out.

Start with YoutubeChannelHelper.java:154 and trace the fetchPage path through YoutubeChannelExtractor.java:92 and Extractor.java:60. Reproduce the ChannelExtractor request and inspect the response JSON when onResponseReceivedActions is absent. Done means the channel fetch no longer fails with a NullPointerException for that response.