I fill meta title for design settings and for seo settings in homepage cms, and still on homepage have empty meta title, for each other page works great.
Where I should find solution?
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page_content_heading hasn't been removed in your layout updates. CMS pages are passed through the helper method
\Magento\Cms\Helper\Page::prepareResultPage which looks for that block. If the block is included it will go through the usual
_prepareLayout process which contains the method which sets your meta title from the page data.