Like the ERM module, the Preservation module is built in Vue and the compiled assets need to be included in the Makefile for the Debian package to include them.
Created attachment 162842 [details] [review] Bug 36250: Add preservation.js to Makefile
It seems a fix for this has just been pushed, Kyle. Thanks for taking care anyway! *** This bug has been marked as a duplicate of bug 35759 ***