So I am learning Messiaen's Transports de Joie from L'Ascension suite. Things are fine until there is an ambiguous note on the top of page 16 (we are in F♯ Major and both hands are in the treble clef):
(Please excuse the heavily marked score.) I have marked with pencil a sharp sign next to the E, but I am really not sure how this should be played. Previously, as in the first and second beat in this measure, there is a melody line in the left hand that is frequently tied to the bottom note of a chord in the right hand. However, since we are in F♯ Major, I do not know what the bottom not of the chord indicated should be. According to the key signature, it should be an E♯, but according to the fact that it's tied, it should be an E♮.
Has anyone performed this piece before or knows enough about music typography to answer this for sure?