[NTG-context] Font scaling via sa in LMTX

Hello list, It seems that font scaling to a letter is not working consistently in LMTX. This example: \definefont[TitleA][Sans sa a] \definefont[TitleAB][Sansbold sa a] \starttext {\ssa This is ssa \TitleA and this is TitleA}\par {\ssbf This is ssbf \TitleAB and this is TitleAB}\par \contextbanner \stoptext Produces different relevant output with each engine. I suppose one could use numeric values instead of defined font size letters as a work-around, but that means lack of coordination with custom sizes in \definebodyfontenvironment. -- Rik