Closing this thread as issue is fixed by “Woocommerce 8.5.2” update .
Temporarily changed to PHP version 7.4 , working for me .
Will leave this thread open for a permanent fix
Thanks @oliverpierceuk
I was able to resolve this by adding “Funnelkit” plugin just for the checkout page as it was urgent.
There seems to be a conflict between “Astra” theme and the “woocommerce Square” plugin , as i noticed this issue resolved when i deactivated Astra.
Store checkout page is critical and I cant reproduce the error but I did take the screenshots before :
https://ibb.co/pwgvwPb
https://ibb.co/m60WYYs
Please have a look , Thanks.