When running a closure is applied to a list of lists though a method like `findAll`, the multiple assignment does not destructure the inner lists into individual variables, but set the first variable to the inner list, and the other variables to null.

If I run the following script as a pipeline:

#!/usr/bin/groovy
 def res = [:]
 [["tata", 123, 1], ["toto", 456, 2], ["titi", null, 3]].findAll { k, v, x -> println "${k}, ${v}, ${x}"; v != null }.each
{ k, v, x -> res[k] = v }
println res

I would expect that my lists of 3 items are destructured into k, v and x. This way, I could only keep the lists whose second item is not null.
Instead, I get this output:

[tata, 123, 1], null, null
[toto, 456, 2], null, null
[titi, null, 3], null, null
{}

If I run the same code in the Jenkins console, I get

tata, 123, 1
toto, 456, 2
titi, null, 3
[tata:123, toto:456]

The multiple assignment works properly if done on a map:

#!/usr/bin/groovy
 def res = [:]
 ["tata": 123, "toto": 456,"titi": null].findAll{ k, v -> v != null }.each{ k, v -> res[k] = v }
println res

it gives:

{tata=123, toto=45

Note that it behaves properly when the code is run outside of Jenkins.