Incorrect preview link for nested structure

Hi
I have tree struct of my blog, more 2 , 3 levels.
Real link
netlify.app/html/conversion-api/conversion-sdk-api/xhtml-converter/
but preview link is corrupt and present as
netlify.app/html/conversion-api-conversion-sdk-api-xhtml-converter-_index

Please, advise workaround for it case

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