Hope you're okay! So very sorry to see the plugin won't be maintained but I hope I can still bother you with a question about it.
I have seen a drop in indexed urls on my site lately, and I just found out it has probably to do with this: pto_sitemap produces an xml with all the feeds, but all XML's in it give a Wordpress critical error page.
This Error page doesn't give a clue on what could be the problem (with all DEBUG's in wp-config on). In the standalone version of the site, the sitemap is created without problems.
I turned off the plugins, but still no go.
Do you have any idea what could be happening? Thank you!
With kind regards,