Hey -
If you create a new blueprint based on the same actor are you still unable to see the FVector variable in the inherited list? I created a class based on Object and then created a blueprint based on the new class. After creating the blueprint I added a UPROPERTY() macro and FVector variable to the code and did a hot reload (right click on the project name as select Build). Is this the same workflow that you used?
In response to your second question, it would be best to start a separate post so that the two issues don’t get confused in the same thread. Creating a new post will also make it easier to search for if someone else is having the same problem. Please be sure to include as much information to describe the problem as possible.
Cheers