I like java-version. There is a little bug (with the word "just") in the test. Hopefully it will be fixed soon. Overall the kata is good.

Yes. It's the first line in the interpret method. variables = new HashMap<>();

I found a bug in my first solution.
But the the solution was accepted.
In my solution helper.pageIndex(7) returns 1 instead of -1.

Eventually I found a solution.
int n = array.length;
if (n == 0 || array[0].length == 0) return new int[]{};

Something is wrong with the test for Java.
When I start my code in IntelliJ IDEA the result is the same as expected.
But when I copy and start the code in the browser the result is like:
"mov a -10", "mov b a", "inc a", "dec b", "jnz a -2"
expected:<{a=0, b=-20}> but was:<{a=0, b=-20, c=409600, d=1}>
The variables "c" and "d" obviously came from the previous test.
The problem was resolved after I put "new HashMap<>();" inside method interpret.

It seems to me the description is obvious, but testing is vague.

1 Yes. Ideally a dash must be the same length as triple space.
2 Yes. If I'm not mistaken there was a test contained only two dashes and a longspace between them (2 letters and space: "T T").
3 Yes. You have to calculate the criteria between length of dots and dashes - how many digits 1 make a dot, and how many make a dash.

Be ready to meet other situations and tests even more vague.

testShortMessages
expected:<E[ ]E> but was:<E[]E>

What do that mean?

In this kata I made up a math formula and put it in the return.
This way timeout is impossible.

The task is not about programming code.
Actually, it is a problem of making up a math formula and putting it into return.
Such kata doesn't improve my coding skills.

Wonderful. The short code works miraculously.

What should be returned for empty array in Java ?
I've tryed return new int[]{} and return new int[0]
My brain is broken.