Incorrect source map generated with Sprockets 4

[GCorbel]

In a project, I use Rails 5.2, Sprockets 4 and vuejs-rails 2.5.13. On Firefox, I have the warning "Section offsets must be ordered and non-overlapping." and source map isn't read by FF.

I was able to reproduce the issue with :

<%= require_asset 'dist/vue.js' %>

This seems to work :

<%= Rails.application.assets.find_asset('dist/vue.js').source.html_safe %>

Subquestion : Is it still useful to have the minified version of Vue ?