instead of using state="SomeTiddler" use state=<<qualify "SomeTiddler">>
(see https://tiddlywiki.com/#qualify%20Macro)
The <<qualify>> macro automatically adds a unique “magic number” to the end of the state tiddler title. The number is based on the location in the “widget tree”, so it will be different for each tiddler in which the $reveal occurs.
-e