The best things will always be silently removed.
In V1 it was possible to apply an arrowhead to a decoration, in V2 you can select an arrowhead, but it vanishes right after selection.
Arrowheads in Decorations are in fact not completely removed in V2. Just copy arrow decorated text from V1 to V2 and the arrows appear in the Stroke popup of Decorations. You can change the size of the arrowheads, but not their type.
Expected behaviour that arrowheads were removed?