Some augmented assignment operators not highlighted properly

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Prerequisites

• [x] Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: https://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: https://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
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Description

Some augmented assignment operators are not highlighted properly (at all).

Steps to Reproduce

1. Operators &=, |=, ^=. >>=, <<= and := (though not technically an augmented operator) are not highlighted. Other common operators (such as +=) are highlighted correctly.

Expected behavior:

All augmented assignment operators to be highlighted.

Actual behavior:

Some operators are not highlighted.

Reproduces how often:

100% of the time (with my testing)

Versions

atom --version:

Atom    : 1.58.0
Electron: 9.4.4
Chrome  : 83.0.4103.122
Node    : 12.14.1

apm --version:

apm  2.6.2
npm  6.14.13
node 12.14.1 x64
atom 1.58.0
python 3.9.7
git 2.25.0.windows.1
visual studio 2019

Additional Information

Screenshot in safe mode: