Hello,
i had made a mistake in indicating G left hand, instead of B.
Perhaps by mistake, in the beat I meant on the second chord of the measure.
To recap, I thought I would execute it this way: (B) in the left hand, (quarter note), F#-G# with the right hand, (after the eighth rest), (B) of the appoggiatura, with the right hand, (fast), which falls on the second beat of the measure, then together F#, A (right hand) simultaneously with D#, G#, B# of the left hand.
In this way, the chord F#, A, right hand, with D#, G#, B#, left hand, loses half of its value, and does not fall on the second beat, but between the second and the third.
Instead, I seemed to understand from your response that the appoggiatura (B) should be executed between the first and the second beat of the measure, then the chord follows on the second beat. In this way, however, the problem arises because between the first and the second beat there is already F#-G# in the right hand.
(I hope I haven't made it too complicated, and I apologize for this).