Substring "on-" in the page path

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If you make a page that has a substring "-on" in the page path, that substring is somehow deleted when the page properties are saved.

For example, if you create a page xyz.com/on-site-testing or xyz.com/test-on-site, the page path is actually saved as xyz.com/{site-testing,test-site} respectively.

In some older versions, this was not the case. But in 5.6.0.2 this happens, so I cannot maintain the same page path once I edited the page properties.

Can someone help on this?

Thanks,

Ryuji

RyujiS