During theme initialization, block_theme_initialize() copies over existing blocks and gives them a machine name prefixed with the theme name. This severs the link between the blocks in the subtheme and their twig templates.
Given a block named "mysubtheme-myblock" we check the current theme for "block--mysubtheme-myblock.html.twig" as we do currently, then look for "block--myblock.html.twig" in the parent, then resume the current order of possible theme names for a match. This is complicated though by block names containing an underscore or dash. It might be necessary for blocks to be aware of their compliment in the parent theme, if any, if that isn't in place already.
Closed: outdated
11.0 🔥
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This feels like a feature request - Can we get a list of steps to reproduce?
Doesn't appear to have been any follow up since #17. Going to close out for now, if still a valid request please reopen.