Find loop path in "find path" not right

[Codelone]

nebula v2.5 version
when I use "find path" , and set the same vid, the result is not right.
FIND ALL PATH FROM "B" TO "B" OVER * BIDIRECT UPTO 10 STEPS;
the result is nothing
FIND SHORTEST PATH FROM "B" TO "B" OVER * BIDIRECT UPTO 10 STEPS;
the result is "A->B<-A" ，This is obviously not a loop path，It seems that the shortest path is found through reverse edge traversal。
It seems not support loop path，maybe you can support to find loop path？

[CPWstatic]

Fixed by #2773