Looking over this piece and I'm stumped trying to interpret the 4s in bar 29 and the 3s in bar 30. Also bar 30 is perplexing because there are 6 quarter notes. The piece is in 6/8 time. I don't think these are fingering suggestions. Bar 30 is completely confusing.

[![Alkan Prelude in Ab minor, Op. 31, No. 8, mm. 29–31](https://i.stack.imgur.com/OK9mJ.png)](https://i.stack.imgur.com/OK9mJ.png)