PHP in Antlers incorrect highlight

[venux92]

Describe the bug
If you add some PHP into an antlers.html file the highlight is incorrect.
It's misleading because you feel you have some issue but the file works correctly.

OS:

• Mac
• Linux
• Windows

Jetbrains Product:

• PhpStorm
• IntelliJ

IDE Version:

• [PS-232.10227.13]

Plugin Version:

• [0.0.6]

To Reproduce
Go to https://statamic.dev/antlers#syntax

Copy the example code
<a href="{{$ route('account.register') $}}">Register for a new account</a>

Expected behavior
Should keep the correct highlight as if we are using variables {{ variable }}

Screenshots
-- with variables --

-- with php --

[potsky]

Same problem here on MacOsX.