I am half way through a 10k Garmin coach plan and the pace I need to run between has always been visible when I look at the workout. Today it has just disappeared and I can seen no pace for any future runs. 
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We're following up on the report we received that when viewing your workouts in your Connect app that had pace, cadence, or power ranges, the workouts' targets showed as blank or just 0. We're pleased…
We have enough reports of this at this time. The engineering ticket is being worked and I will notify you all with an update when the fix is available. Thank you.
I just updated to Version 4.69.1.5. Seems to have fixed the issue.
Me too
It has been over 5 days!! Please fix it today.
My race is in two weeks, I have doubts now that the plan could achieve the target pace.
Did you try using Garmin Connect Web and sending the workouts to the watch with Garmin Express? I do not have any Training Plan active, so cannot confirm, but others reported in this thread that the pace is shown all right when using GC Web.