This is really strange, This issue does not occur on our localhost, nor we have ever seen or heard of this issue on any other user’s site.
I think this could be a 3rd party plugin which is conflicting.
Can you share me the list of the active plugins?
Accelerated Mobile Pages
Select Ad Inserter
Select Add Featured Image to RSS Feed
Select Akismet Anti-Spam
Select Automatic Schema
Select Contact Form 7
Select Facebook Reviews Widget
Select GDPR Cookie Consent
Select Google Captcha (reCAPTCHA) by BestWebSoft
Select Google Reviews Widget
Select MNKY | Visual Composer Pricing Boxes
Select PayPal for WooCommerce
Select Popup Maker
Select PWA for WP
Select Quick Featured Images
Select Really Simple SSL
Select Recent Posts Widget Extended
Select Slider Revolution
Select Slider Revolution Background FilmStrip Add-On
Select Slider Revolution Background Slicey Add-On
Select Social Share Buttons by Supsystic
Select Update ALT Attribute
Select UpdraftPlus – Backup/Restore
Select WooCommerce
Select Wordfence Security
Select WP Mail Logging
Select WP Rocket
Select WPBakery Page Builder
Select WPeMatico
Select Yoast SEO
any update? As I can’t leave my website without RSS or woocommerce much longer
I’m sorry for the delay,
You seem to have one plugin which actually works with in the feed, called “Add Featured Image to RSS Feed”
Can you try to deactivate that plugin, clear the cache and check if this issue fixes for you?