Include captions on import preference still broken

It's been two months and the include captions on import preference is still broken. Check it or uncheck it, if the media has embedded 608/708 captions, the import time of the media takes a long time to import into Premiere.  I have detailed this issue in the other Prerelease forum under Bug ID - DVAPR-4232208.

Today I tested 3 versions of Premiere to see if this is still an issue.

Version 14.9.1 (build 1) you do not see this slow import issue.

Version 15.4.0 (build 47) you do see this slow import problem.

Beta Version 22.0.0 (build 51) you do see this slow improt problem.

For example, importing 16 ProRes feature films with embedded 608/708 captions leaves Premiere in an unresponsive state for hours while it chews through reading the captions. 

The workaround response from engineering is to use a file with "a contiguous block of captions" vs interleaved captions. Can you tell me how I request that from the Hollywood studios that have embedded their feature films captions the same way for years. I'm happy to request this option, I just don't know what to ask for since they embedd their files in Vantage workflows I'm not privy to. 

I know the team has spent the past year developing the new Speech2text /caption revisions for Premiere and I salute you all for this major improvement. Something got broken in this transition and is major slowdown to our workflows when dealing with feature film caption embedded movie files.