Prepaid Expenses entry on which GST already paid

I hope you have received service , now as per section 13 of the CGSTAct ,  in case of services ( please refer and confirm) , time of supply for payment of GST on prepaid expenses earlier of the following 

1) Invoice date 

2) payment date 

So in your case advance GST paid in 24-25 of 25-26 therefore, time of supply is date of payment , which is correct , So next year only you have adjust prepaid expenses without GST .  

In short, In your Case, as per time of supply ,  GST payable in 24-25 only ,  

Take more opinion on this.