Benchmark run not recognized by garmin coach

Hello,

the benchmark run appears in the activities, but not in the Garmin coach plan.

Troubleshooting:

change description of the activity and saved

suspended coach plan, resynced and restarted plan

deleted activity, reuploaded manually

exit from plan, resync, rescheduled the plan

No results whatsoever.

What should I do???

I see a lot of people with the same issue, since years ago.

Please, advice.

Thank you