NGINX Helper Plugin does not purge AMP pages

Hello,

First off, Thanks a lot for giving me a platform to report this issue.

I generally love to recommend NGINX Helper plugin to everyone who need to purge FastCGI cache. However, I feel skeptical in case site admin uses AMP.

Problem: When I update a post, changes doesn’t reflect for AMP. Changes only reflect for non-amp.

### wp-core ###

version: 5.3
site_language: en_US
user_language: en_US
timezone: +00:00
permalink: /%year%/%monthnum%/%day%/%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 1
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /var/www/example.com/htdocs
wordpress_size: 37.72 MB (39555663 bytes)
uploads_path: /var/www/example.com/htdocs/wp-content/uploads
uploads_size: 0.00 B (0 bytes)
themes_path: /var/www/example.com/htdocs/wp-content/themes
themes_size: 4.64 MB (4860942 bytes)
plugins_path: /var/www/example.com/htdocs/wp-content/plugins
plugins_size: 3.44 MB (3609594 bytes)
database_size: 2.11 MB (2211840 bytes)
total_size: 47.91 MB (50238039 bytes)

### wp-active-theme ###

name: Twenty Twenty (twentytwenty)
version: 1.0
author: the WordPress team
author_website: https://wordpress.org/
parent_theme: none
theme_features: automatic-feed-links, custom-background, post-thumbnails, custom-logo, title-tag, html5, align-wide, customize-selective-refresh-widgets, editor-color-palette, editor-font-sizes, widgets, menus, editor-style
theme_path: /var/www/example.com/htdocs/wp-content/themes/twentytwenty

### wp-themes-inactive (3) ###

Twenty Nineteen: version: 1.4, author: the WordPress team
Twenty Seventeen: version: 2.2, author: the WordPress team
Twenty Sixteen: version: 2.0, author: the WordPress team

### wp-plugins-active (2) ###

AMP: version: 1.4.1, author: AMP Project Contributors
Nginx Helper: version: 2.1.0, author: rtCamp

### wp-media ###

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1687
imagemagick_version: ImageMagick 6.9.7-4 Q16 x86_64 20170114 http://www.imagemagick.org
imagick_limits: 
	imagick::RESOURCETYPE_AREA: 122 MB
	imagick::RESOURCETYPE_DISK: 1073741824
	imagick::RESOURCETYPE_FILE: 768
	imagick::RESOURCETYPE_MAP: 512 MB
	imagick::RESOURCETYPE_MEMORY: 256 MB
	imagick::RESOURCETYPE_THREAD: 1
gd_version: 2.2.5
ghostscript_version: 9.26

### wp-server ###

server_architecture: Linux 5.0.0-1025-gcp x86_64
httpd_software: nginx/1.16.1
php_version: 7.3.11-1+ubuntu18.04.1+deb.sury.org+1 64bit
php_sapi: fpm-fcgi
max_input_variables: 3000
time_limit: 300
memory_limit: 256M
max_input_time: 60
upload_max_size: 50M
php_post_max_size: 50M
curl_version: 7.58.0 OpenSSL/1.1.1
suhosin: false
imagick_availability: true

### wp-database ###

extension: mysqli
server_version: 10.4.10-MariaDB-1:10.4.10+maria~bionic-log
client_version: mysqlnd 5.0.12-dev - 20150407 - $Id: 7cc7cc96e675f6d72e5cf0f267f48e167c2abb23 $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /var/www/example.com/htdocs/wp-content
WP_PLUGIN_DIR: /var/www/example.com/htdocs/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable

Please consider fixing as AMP users are growing.

Thanks