Font ligature for BitOrAssign doesn't show

[erazor-de]

Editor: Sublime Text 3 (Build 3208)
Font: Fira Code 2
Rust Enhanced: v2.20.0
OS: Fedora 27 x86_64

Expected behavior

Font ligature for |= should be shown when entered in a file with Rust Enhanced syntax active.

Actual behavior

The two distinct characters |= are shown instead. Other ligatures for constructs like ==, <<=, =>, != work. The ligature for |= works with plain text syntax. Sublimes original Rust syntax is deactivated.

Steps to reproduce

1. Select File/New File
2. Change syntax to Rust Enhanced
3. Enter the two chars |=