The mark crossed out in A on the 2nd beat of bar 524 is most probably a crotchet rest. It means that initially the L.H. part was the same as in b. 516 (except for the enharmonic difference in the notation).
We were not able to determine what the crossing-out in a similar place in b. 525 concerned. In turn, it seems that the dots extending the b-b1 crotchet and the quaver flag of the first g
-e1 sixth could have been added later, which is indicated by the spaces between the notes.
Compare the passage in the sources »
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A, Accompaniment changes
notation: Rhythm