When setting up a Highlighted Content part on a modern page, sometimes my query will output the following 4 rows (1 x "Automatically show content from your site", with 3 x "Title"):

These do not reflect my content in any way, and almost seem like placeholder content to indicate that my query has errors...

Thanks in advance for anyone who can help me understand this odd behaviour.

When setting up a Highlighted Content part on a modern page, sometimes my query will output the following 4 rows (1 x "Automatically show content from your site", with 3 x "Title"):

These do not reflect my content in any way, and almost seem like placeholder content to indicate that my query has errors.

Thanks in advance for anyone who can help me understand this odd behavior.