When trying to change data on "My Account" page (/account) through myvtex.com domain, they are not updated correctly.
This problem is limited to the legacy version of the account page.
You may notice that there is a 404 error in DevTools requests.
This happens only in "myvtex.com" environment and can be bypassed by using "vtexcommercestable.com.br".
Since the store's final domain is based on "vtexcommercestable", this problem will not happen in production.
This scenario is permanently fixed in the new "My Account" App that will replace the legacy version soon.