Site Page Structure:
In AEM 18.104.22.168, When we try to move/rename page B under Parent A, move option gets disabled. where as if we move page B under C, move option is enabled.
It is causing issue because if in order to rename a page, we have to use same move/rename option and when source/destination is same, move option gets disabled.
Any help will be really appreciated.
Thank you in advance.
There were few known issues with the move/rename feature. These issues have been resolved in 6.4.7 and 6.4.8. Check the release notes  and search for NPR-31841. I would suggest testing with the latest Service pack.