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It looks like the issue is random and happens on new projects and on old projects. All users are using the default KVS sitemap page provided.
Here is screenshot from Google shared by one of users and while Google indexes some of the sitemaps that are printed in /sitemap.xml, it ignores all video sitemaps that are also printed there. So the sitemap index syntax is fine and accessible.
We tried to check for possible issues:
KVS renders sitemaps with 500 links, the possible limit is up to 50000
Size is also much below 50mb
XML valid
The funny thing is that it looks like if you upload a video sitemap separately it will be indexed, but since sitemap is paginated by 500 items it is not convenient.
Indeed, this issue I can confirm it is exists
Sometimes I can submit it without problem (success), but sometimes it says "Couldn't fetch" and I totally have no clue, all settings are same everytime, I'm using cloudflare but I already add "bypass" known bots in cloudflare setting
I did some digging about this issue, and they (staff from google) said something like "this issue is not too much serious, it can read but may still display error Couldn't fetch"
Many times I observe that even I submit sitemap success or "couldn't fetch", my site's traffic is hardly notice, traffic is not drop significant when sitemap can't read
But I do think submit sitemap is still important regardless its status success or fail to read, if sitemap is accessible then I think it's okay, also I think submit sitemap under sitemap.xml is better than sitemap.php