Hi,
I believe its is coming from some configuration, can you check if your implementation adding those
example
https://github.com/arunpatidar02/aemaacs-aemlab/blob/f96ce5316dfa4798c72d2e87d3a0b41fc49791a4/core/src/main/java/com/community/aemlab/core/services/sample/MySitemapGenerator.java#L37