[dasymington]

No, the template icon sticks as it was. Shift+F5 doesn't restore the icon; it remains as the Text template icon.

The icon changed in two items some time after I'd edited them. Both were showing the proper icon until I viewed a few other items and opened and closed another tab.

Here's what I've been able to repeat:

Open Document
Edit document in Wordpad
Save document in Wordpad
Close Wordpad
Resume internal editing
Click on another item (2 up) in tree
Open another tab from button on tab bar
Open a favourite in this new tab from favourites toolbar
Hoist
Close tab
Click on original tab (I had two open originally)
Open tree to look at the item I'd edited in the tree: icon has changed to text template icon

These are probably not the minimum steps necessary to repeat the behaviour.