Once you create a variable in the Blueprint editor where you mistype the name, say “myLOcation” you can not change it. I thought it might just not check if you change just the “O” to “o” and was a lowercase equality check but event temperately changing the value to something else, say “tempName”, then back to “myLocation” it will still revert the “O” back to capital.
Update: Even deleting the variable and adding a new one the name will still get reverted back to the wrong case version.