Custom Events with Default parameter names causes an internal compile error

Custom Events with Default parameter names causes an internal compile error

User Description:

I'm not sure if it's a bug,but I post it in bug reports in case it is.Here is the problem:

create a custom event with one param
create another custom event with two params
all params use default names
compile
you'll encount a internal compiler error

I know it's a bad habit to use default names , but I thought it may be a bug.

1. Open QA-Game
2. Create an Actor class BP and open it
3. Add a Custom Event (leave default name)
4. In the Details panel, add a new parameter (leave default name)
5. Add another Custom Event (leave default name)
6. In the Details panel, add 2 new parameters (leave default name)
7. Compile the BP

Results: The BP will have an Internal Compile Error and says the "NewParam2 already exists".

Expected: For the blueprint to compile without error.

Fix UE-51650

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