Invalid sparse file format at unknown block

[booroondook-eng]

I have super.img file. It was extracted from a firmware package for a TCL Smart TV.
Its size is 1 519 002 649 bytes.
This file looks at sparsed image:

# file super.img
super.img: Android sparse image, version: 1.0, Total of 1179648 4096-byte output blocks in 5451 input chunks.

But when I try to repack it to raw format I get the following:

# simg2img super.img super.raw
Invalid sparse file format at unknown block 3126 at 401476
Invalid sparse file format at unknown block 056E at 401488
Invalid sparse file format at unknown block 86A0 at 401500
Invalid sparse file format at unknown block 84E6 at 401512
Invalid sparse file format at unknown block A159 at 401524
Invalid sparse file format at unknown block A3C1 at 401536
Invalid sparse file format at unknown block 49EC at 401548
.......
Invalid sparse file format at unknown block 4D27 at 466804
Invalid sparse file format at unknown block A757 at 466816
Invalid sparse file format at unknown block 9E6E at 466828
Invalid sparse file format at unknown block 68C9 at 466840
Invalid sparse file format at unknown block 7E74 at 466852
Failed to read sparse file

See also the first 4096 bytes of my super.img (see attached file)/
super4096.zip