Moderation sidebar is saying "No reason given"+"Add note" after own moderation action but a note was added and is already shown in the activity log.
For other editors there is no "Read note".
This _could_ disappear after some time but it not a single case. Currently I'm waiting for more than 30 minutes.
Then I voted down the feedback and instantly it is displayed correct again.
It was reported by different users at different times.