MY GSC, under Crawl - Sitemaps is now telling me I have an error.
I have always had 2 sitemaps - .txt and .htm - for over 10 years.
But for a month now, my .txt sitemap says --->
"Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead."
My Bing Webmaster Tools used to love my 2 sitemaps, and applauded me for having both -
One for bots, and one for visitors. I just checked - not any more.
Just the complicated unwieldy .xml, which I don't want to deal with, and .txt.
I STILL think it is a good idea to have an HTML sitemap for visitors.
But, apparently, now, you MUST NEVER SUBMIT IT.
Or you will be told that it is unacceptable with a yellow exclamation point "ding".
So, I believe that having an HTML sitemap for visitors is good - just don't ever submit it.
I deleted it from the GSC, to make them happy,
but I have NO intention of deleting it from my site.