[Python] For-loop with the walrus operator inside the range

Why are the negative k values being printed as the original value, but when we enter the positive realm, it gets strange?

In:

def j(k):
for i in range(i:=k):
i+=i
print(i)
for i in [-5,-4,-3,-2,-1,0,1,2,3,4,5]:
j(i)


Out:

-5
-4
-3
-2
-1
0
0
0
2
4

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