Navigation links disappear after upgrade to Magento CE 2.4.5

I’m somewhat of a Magento noob and inherited this site. I upgraded to 2.4.5 from 2.4.0 and basically the top links and footer links disappeared. For example, this block is no longer displaying:

                <block class="MagentoCustomerBlockAccountNavigation" name="top.links">
                    <arguments>
                        <argument name="css_class" xsi:type="string">header links</argument>
                    </arguments>
                </block>

In: ./app/design/frontend/Magento/themename/Magento_Theme/layout/default.xml

But it’s not just that. The Advanced Search and custom footer modules also disappeared. It’s like these files aren’t even being called:

./vendor/magento/module-customer/view/frontend/templates/account/navigation.phtml

If it’s any help, I think this is a custom theme that was forked off of Luna theme at some point, but not sure.