In FDC case ruling by the Mumbai bench of ITAT in (2024] 119 ITR (Trib) 799 (ITAT[Mum]) which while setting aside the revision order by the Commissioner held that there is no statutory bar in claiming the deduction under section 80G of the Act if the CSR expenses are otherwise allowable as deduction under that section as being of the nature of DONATIONS TO CHARITABLE INSTITUTIONS.
Before there is any kind of bar imposed in future, which may be likely, it may be prudent to make a claim in past/present returns of income citing this view.