custom dynamic mark loses "e"

[Graham Percival]

In 2.4, I had a custom command for "f espr" (thanks Mats!).  In recent
2.5, the "e" is lost from "espr".  Is this due to scheme changing (ie it
tries to look for dynamic fonts for the "e" and can't find any, so it 
doesn't
print anything), or some other issue, or...?

Cheers,
- Graham

\version "2.4.0"
#(def-markup-command (text paper props arg) (markup?)
  "Use ordinary text font."
  (interpret-markup
   paper (prepend-alist-chain 'font-encoding 'ec props) arg))

fespr = #(make-dynamic-script (markup #:dynamic "f" #:text #:italic 
"espr" ) )

{
c4\fespr
}