Conflict with Built in Sitemap

Hello –

When I checked my sitemap (the one automatically created by WordPress) I got a blank screen for https://mydomain.org/wp-sitemap.xml

By deactivating plugins one at a time the sitemap works again when this plugin is deactivated and all others are active. The problem was reproduced in the staging server which does not have SSL and the production server with SSL. Problem was also reproduced with twenty twenty-one theme.

Thanks!