[Blog Terminal Plugin] How to use wrapped box in editor

Servus Community,

To display the input and output of terminal commands in a suitable way I came across the Blog Terminal plugin. It reads quite well what it can do but it can not really be used in the editor of WordPress. Surely I’m too stupid and ask for support.

When I type the syntax of the plugin [terminal]test[/terminal] character by character it is displayed as I would expect. But if I then do a manual line break, the cursor jumps a few lines. Both in the editor and in the output on the web page.

If I copy a whole multiline output of a terminal, possibly even with spaces, and paste it between the two enclosing boxes [terminal][/terminal], the editor jumps into its format mode and does quite strange things. Sometimes it inserts a separator line, sometimes it generates a Headline, but it never does what it is supposed to do in this case, which is nothing.

What am I doing wrong?

Server Information:

### wp-core ###

version: 5.6
site_language: de_DE
user_language: de_DE
timezone: Europe/Berlin
permalink: /%category%/%postname%/
https_status: false
multisite: false
user_registration: 0
blog_public: 1
default_comment_status: open
environment_type: production
user_count: 1
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /home/VirtualHosts/www.prontosystems.de/wordpress
wordpress_size: 45,74 MB (47956645 bytes)
uploads_path: /home/VirtualHosts/www.prontosystems.de/wordpress/wp-content/uploads
uploads_size: 0,00 B (0 bytes)
themes_path: /home/VirtualHosts/www.prontosystems.de/wordpress/wp-content/themes
themes_size: 7,34 MB (7696025 bytes)
plugins_path: /home/VirtualHosts/www.prontosystems.de/wordpress/wp-content/plugins
plugins_size: 321,02 kB (328723 bytes)
database_size: 928,00 kB (950272 bytes)
total_size: 54,29 MB (56931665 bytes)

### wp-active-theme ###

name: SMNTCS Retro (smntcs-retro)
version: 1.11
author: Niels Lange
author_website: https://nielslange.de/
parent_theme: none
theme_features: core-block-patterns, automatic-feed-links, responsive-embeds, post-thumbnails, title-tag, html5, widgets, menus
theme_path: /home/VirtualHosts/www.prontosystems.de/wordpress/wp-content/themes/smntcs-retro
auto_update: Deaktiviert

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

Twenty Nineteen: version: 1.8, author: WordPress-Team (latest version: 1.9), Automatische Aktualisierungen deaktiviert
Twenty Twenty: version: 1.6, author: WordPress-Team, Automatische Aktualisierungen deaktiviert
Twenty Twenty-One: version: 1.0, author: WordPress-Team (latest version: 1.1), Automatische Aktualisierungen deaktiviert

### wp-plugins-active (1) ###

Blog Terminal: version: 0.2.1, author: Radek Sprta, Automatische Aktualisierungen deaktiviert

### wp-plugins-inactive (3) ###

Akismet Anti-Spam: version: 4.1.7, author: Automattic, Automatische Aktualisierungen deaktiviert
Hello Dolly: version: 1.7.2, author: Matt Mullenweg, Automatische Aktualisierungen deaktiviert
SimTerm: version: 0.3.0, author: Gaspar Fernández, Automatische Aktualisierungen deaktiviert

### wp-media ###

image_editor: WP_Image_Editor_GD
imagick_module_version: Nicht verfügbar
imagemagick_version: Nicht verfügbar
file_uploads: File uploads is turned off
post_max_size: 8M
upload_max_filesize: 2M
max_effective_size: 2 MB
max_file_uploads: 20
gd_version: 2.2.5
ghostscript_version: not available

### wp-server ###

server_architecture: Linux 4.19.0-13-686-pae i686
httpd_software: Apache/2.4.38 (Debian)
php_version: 7.3.19-1~deb10u1
php_sapi: apache2handler
max_input_variables: 1000
time_limit: 30
memory_limit: 128M
admin_memory_limit: 256M
max_input_time: 60
upload_max_filesize: 2M
php_post_max_size: 8M
curl_version: 7.64.0 OpenSSL/1.1.1d
suhosin: false
imagick_availability: false
pretty_permalinks: true
htaccess_extra_rules: false

### wp-database ###

extension: mysqli
server_version: 10.3.27-MariaDB-0+deb10u1
client_version: mysqlnd 5.0.12-dev - 20150407 - $Id: 7cc7cc96e675f6d72e5cf0f267f48e167c2abb23 $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /home/VirtualHosts/www.prontosystems.de/wordpress/wp-content
WP_PLUGIN_DIR: /home/VirtualHosts/www.prontosystems.de/wordpress/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: utf8mb4
DB_COLLATE: undefined

### wp-filesystem ###

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

Thanks for your attention and sorry for this newbie question.

Bye Tom

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