The current MiKTeX setup uses ushyph.tex as the default hyphenation table. This is not strictly a bug. But it can lead to different line breaks (in comparison to other TeX systems). Therefore I will change language.dat as follows:

< english ushyph.tex
---
> english hyphen.tex

hyphen.tex is the classic hyphenation table written by Knuth.

The revised language.dat will be made available with the next MiKTeX update.