I've some error console bus in checkout page when upgrading core. Does anybody know where this bug is from?
Failed to load the "Magento_Checkout/shipping" template requested by "checkout.steps.shipping-step.shippingAddress".
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check your custom shipping.html file: app/code/YOUR_VENDOR/MODULE_NAME/view/frontend/web/template/shipping.html
In this file something is not correct. The newest Magento 2.4.x seems to be more strict about that.
For start you can just clean that file to the empty state and refresh the page. You should now see no more errors. You should investigate which content of this file is causing problems. The possible causes include:
<span /> or <div />, whereas they should be