Not a good puzzle. The final shapes of the blobs are ambiguous and there's no clue to good clue within the puzzle to guess them.

Here's the hint: the blobs are squares, slightly rotated left.

That was brutal.

Tough guesswork at the very end. I guess there are only so many possibilities though.

:T.

It's very easy. Logic...

No logic at all... There are nine rectangles with two possible shapes each, which means some 512 solutions :(

The nine parts in the middle are not rectangles - they are a strange shape.

The first of the nine shapes is as follows:
R3: C11-12
R4: C9-12
R5: C9-13
R6: C10-13
R7: C10-11

The other eight shapes are identical to this shape just in a different area of the Hanjie.

Hope that makes sense.

Thank you, Anita.