Here, you can find the patch for the issue that almost all the merchants are getting while transacting the payment via PayPal through Braintree on Magento/Adobe v2.4.6 & v2.4.6-p1/p2 (this is mainly happening with Magento Open Source).
I would suggest you apply the attached patch to resolve your issue. We already have provided this patch to some merchants. It has resolved their issues and were able to place the order successfully via PayPal through Braintree.