This was likely introduced in a tinyMCE upgrade. It only impacts embedding file links into a "rich text" area which many people do not do; relying instead on the view to render associated files. Also there is a readily available workaround; reload the edit handler (save/re-edit, move between wizard steps, etc).
- fix it and submit a pull request
- pay for it to be fixed (Daemon can certainly assist here)
- hope that the bug impacts another user enough that they do one of the above
Daemon have earmarked the upgrade of tinyMCE as something we'd like to to in the short to medium term. We'll be sure to double check this issue when we get to the editor upgrade.