Block component overrides all template suggestions

I am converting a theme that was made with Radix 4 to 6 because boostrap 4 is EOL and upgrading is non optional at this time. I have carefully followed the migration instructions.

For the life of me I cant seem to get template suggestions to fire any more that are more specific than the block component. I am unsure what I am doing wrong and have spent a while working on this. I have a template file block--swiftype--header-search.html.twig, containing `{% embed 'mytheme:block--swiftype--header-search.html.twig%}`.
my component and related javascript is never picked up.

Twig debugging shows that block.html.twig is currently in use even though a template suggestion for block--swiftype--header-search.html.twig exists. (I do not know why template suggestions show up multiple times).

<!-- FILE NAME SUGGESTIONS:
   ▪️ block--enterprisesearch--header-search.html.twig
   ▪️ block--swiftype--header-search.html.twig
   ▪️ block--swiftype--header-search.html.twig
   ▪️ block--enterprisesearch.html.twig
   ▪️ block--swiftype.html.twig
   ▪️ block--swiftype.html.twig
   ✅ block.html.twig
-->

What am I missing?
Note: I have also tried naming the files block__swiftype__header_search.html.twig, block--enterprisesearch.html.twig and block__enterprisesearch.html.twig