Why does Qooxdoo build version break the code?

Question

JavaScript

Good to everyone! There is a code compiled on qooxdoo. If the source version, then it works locally without problems, if the build version, it starts but does not work. The console gives no errors. It does not work that certain events are attached to the buttons on the keyboard, namely (left, right, up, down, space). The implementation goes through qx.ui.command.Command. Apparently qooxdoo breaks the code. Tell me what could be the problem! Thank you!

Answer 1

I read that it breaks the code, a private variable, changed it everywhere to public ones, it didn’t help!