Howdy!
That’s strange. We’ve never heard of this issue before, nor does it seem likely — TSF blocks its redirect functionality when a feed is requested. Perhaps some parameters are shifted abnormally by the theme or another plugin, or something else engages a redirect once TSF is detected.
Could you re-enable the plugin so I can inspect the redirect headers? Thanks!
I reactivated it, and the redirect is not happening anymore. There must be something else engaging the redirect, as you said. I will keep and eye on it and keep you posted if it happens again.
Interesting. Thanks for testing! This sporadic behavior might be because WordPress Rewrite Rules get flushed (incorrectly) by another plugin or theme during plugin activation/deactivation.
The corresponding, poorly documented function causes many issues, for which WordPress has a ticket open for 11 years: https://core.trac.wordpress.org/ticket/18450.
I’m marking this as resolved. I believe you’ll find this issue will happen again when you (de)activate any plugin, but finding the cause is difficult without Rewrite API experience — even deactivating the offending code might invoke the issue still.
To quickly workaround it in the future, go to /wp-admin/options-permalink.php and simply hit “Save Changes” without changing anything. This will flush the Rewrite Rules engine, often doing the trick.
Thank you very much! I will keep that in mind when the trouble comes back!