Thank you for your comment.
It is piece for a choir (SATB). Maybe unusual, but I think it is
easier to read the notes for each individual voice if they are not
merged, easier to separate e.g. sopranos from altos, which are
both on the same staff. But when the dots do not attach to the
notes they belong to it looks ugly. Also the short piece of the
stem on the upward notes can be hard to see if it stops at the top
head or continues down to middle head when they are merged.
Sometimes you need a magnifier to see this.
On 2018-04-26 kl. 16:31, Andrew Bernard
That would be unusual notation, if piano. The notes lose their
simultaneity, making it unclear to read. What is this for