Am 09.11.19 um 13:16 schrieb Peter Toye:
In this MWE the first a is shifted to the left of the stem but the second one isn't. OK, it's a bit cramped, but I thought that the noteheads were scaled to the size of the staff to avoid this.Oddly, if the local staff size is changed to a global staff size, the anomaly disappears.
This is a bug that was fixed in july: https://sourceforge.net/p/testlilyissues/issues/5303/
The fix has not been included in a released version yet.