Exploding a source Feed:SomeField doesn't work

I'm having the same problem, but I found out that Explode Tamper is not causing the problem.

The output of Explode is always a simple array, when using fields from the feed itself (like Feeds: Source or Feeds: Title).
It's the same output if with set a value a blank source like the values on the feeds fields.

So, Explode Tamper is building the array correctly.

What happens next looks like a Feeds problem, where the module encapsulates the $data result from Explode Tamper on a array, making something like this:

array:1 [▼
  0 => array:8 [▼
    0 => "https:"
    1 => ""
    2 => "xx.xxxxxx.xx"
    3 => "api"
    4 => "v1"
    5 => "cuc"
    6 => "E239"
    7 => "a-id"
  ]
]

Why Feeds is doing this is something beyond my knowledge. I have made a custom Tamper just to reduce this array dimension :(