For example if to wrap a heading in
</product-title> instead of
Is there a mention of the issue somewhere on the Internet?
Webmasters Stack Exchange is a question and answer site for pro webmasters. It only takes a minute to sign up.Sign up to join this community
Semantics does have a value for search engines, that's how they started and it still holds some value.
Answering to your question whether it could impact SEO or not - I would say yes. Custom tags are best to use in scenarios where you don't have to worry about search engines, but for webpages facing the search engines it is best to stick with the standard document model and maintain hierarchy by using the right tags for right purposes. More than search engines it is easier for browsers to understand your better, thus helping the end user in even a small way.
But if you do plan on using custom tags then consider using JSON-LD tags to tell the search engine better about your page's structure.