convert-ly 2.25.3 problem

[Craig Fearing]

In the attached, fairly minimized file:

\version "2.18.2"

\layout {
  \context { \Lyrics \override LyricText #'font-size = #1.8 }
        }

If I try to update to 2.25.*3* (using the tool in Frescobaldi 3.1.3) I 
get a "not changed" response.

If I change to 2.25.*2*  I get the expected result, except that the 
version is set to 2.25.*1*

I tried once more with 2.23.82 which set the version number to 2.23.*14 
*but I didn't go further.

I have attached text files showing the results.

My system is Win10 last updated yesterday.

conv_test.ly
Description: Text Data

conv_test[message]252.txt
Description: Text document

conv_test[message]253.txt
Description: Text document

conv_test[message]2382.txt
Description: Text document