Caption export options still missing for source media with embedded captions

Hello everyone! I support a team that produces media for TV broadcast and we use two primary file types.

Our broadcast playout and capture format is primarily MXF OP-1a wrapped XDCAM HD (or EX) files with embedded caption data (EIA-608 & 708).

We use AME to transcode those broadcast format files to H.264 with sidecar SCC caption files for upload to our on-demand platform. This specific transcode is where AME has been broken for several versions now. 

I'm trying to determine if the bug that Adobe announced regarding AME verison 15.0 has been resolved yet. This bug kept all caption export options from appearing if your source media had embedded captions. My team is currently stuck on AME version 14.9 because we need this feature and that's the last version that had it working. There is a work around involving exporting from Premiere into AME, but that requires two apps and complicates what was a simple workflow, so not a long term solution. 

I've tested every major version of AME released (including 23.2.1) and finding they all have this same bug (and strangely, the same work around). If AME can perform this transcode sucessfully with the Premiere work around, why can't it do it directly from within AME? Are there any plans to resolve this? I know it's an old format, but it's still widely used in broadcast and likely will be for years (famous last words). 

Our team is using Adobe CC apps on Windows 10 64bit machines. I tried to attach a 33mb test file here, but mxf format is not one of the valid types allowed for upload. Happy to share a download link if anyone wants to try this out.