An ornament glyph above a beamed group must clear the beam, not the flag it doesn't have

Trill/turn/mordent glyphs sit above the staff (or above the note) and, on a beamed note, must clear the beam's ink the same way they'd clear a flag on an unbeamed note.

A trill sign over the first note of an ascending beamed run sits at a fixed offset from the notehead and ends up UNDER the beam because the beam slants upward across the group.

Gould, Behind Bars, ch. 'Ornaments'; general convention that ornaments are positioned relative to the outermost engraved element in that column, which for a beamed note is the beam, not the stem tip.

This rule is about where marks land on the page, so it can only be judged after engraving. Collision and spacing faults live here.