Both page 4 and page 5 of the autograph have an open end.
Looking at the third partition, between bar 194-228, a development to the dominant or to the parallel seems to be obvious. A development via the dominant to the tonica could be in combination with the inverse of theme 1, the structure would be as partition 1. A development to the parallel would be comparable to partition 2.
The addition of page 5 after page 4 gives a relatively large part without a theme and a combination of the three themes in tonica (bar 223-). More usually is the development of themes where first two themes are combined, followed by the combination of the third and a regular repetition of the combinations.
At the passage of partitions the piece seems to be incomplete because of the lake of combinations of themes.