Just for some additional testing I disabled all plugins and upgraded to v 3.0.5. Live preview of just the Sydney theme still gives the same error.
Here are the results from Info:
### wp-core ###
version: 5.9.3
site_language: en_US
user_language: en_US
timezone: America/New_York
permalink: /%postname%/
https_status: false
multisite: false
user_registration: 0
blog_public: 1
default_comment_status: closed
environment_type: production
user_count: 22
dotorg_communication: true
### wp-paths-sizes ###
wordpress_path: C:\Webservices\HTTP\batman
wordpress_size: 1.40 GB (1506586349 bytes)
uploads_path: C:\Webservices\HTTP\batman/wp-content/uploads
uploads_size: 452.23 MB (474200977 bytes)
themes_path: C:\Webservices\HTTP\batman/wp-content/themes
themes_size: 16.00 MB (16779917 bytes)
plugins_path: C:\Webservices\HTTP\batman/wp-content/plugins
plugins_size: 177.20 MB (185811280 bytes)
database_size: 89.25 MB (93583912 bytes)
total_size: 2.12 GB (2276962435 bytes)
### wp-active-theme ###
name: Sydney Child (sydney-child)
version: 1.0
author: tnConnect
author_website: https://batman-6/
parent_theme: Sydney (sydney)
theme_features: core-block-patterns, widgets-block-editor, automatic-feed-links, title-tag, post-thumbnails, menus, html5, post-formats, custom-background, align-wide, block-templates, custom-header, infinite-scroll, widgets
theme_path: C:\Webservices\HTTP\batman/wp-content/themes/sydney-child
auto_update: Disabled
### wp-parent-theme ###
name: Sydney (sydney)
version: 2.03 (latest version: 2.04)
author: aThemes
author_website: https://athemes.com
theme_path: C:\Webservices\HTTP\batman/wp-content/themes/sydney
auto_update: Disabled
### wp-themes-inactive (3) ###
Twenty Twenty: version: 1.9, author: the WordPress team, Auto-updates disabled
Twenty Twenty-One: version: 1.5, author: the WordPress team, Auto-updates disabled
Twenty Twenty-Two: version: 1.1, author: the WordPress team, Auto-updates disabled
### wp-plugins-active (32) ###
404page - your smart custom 404 error page: version: 11.3.1, author: Peter Raschendorfer, Auto-updates disabled
Advanced Editor Tools (previously TinyMCE Advanced): version: 5.6.0, author: Automattic, Auto-updates disabled
Better Notifications for WP: version: 1.8.11, author: Made with Fuel, Auto-updates disabled
Blank Slate: version: 1.2.1, author: Aaron Reimann & Micah Wood, Auto-updates disabled
Debug Info: version: 1.3.10, author: AMP-MODE, Auto-updates disabled
Display PHP Version: version: 1.7, author: David Gwyer, Auto-updates disabled
Download Monitor: version: 4.5.92, author: WPChill, Auto-updates disabled
Flexi Pages Widget: version: 1.7.3, author: Srini G, Auto-updates disabled
Font Awesome: version: 4.1.1, author: Font Awesome, Auto-updates disabled
Gravity Forms: version: 2.6.2, author: Gravity Forms, Auto-updates disabled
Gravity Forms integration for wpDataTables: version: 1.6.2, author: TMS-Plugins, Auto-updates disabled
Gravity PDF: version: 6.2.1, author: Gravity PDF, Auto-updates disabled
Gutenberg: version: 13.1.0, author: Gutenberg Team, Auto-updates disabled
Meta Tag Manager: version: 3.0.2, author: Marcus Sykes, Auto-updates disabled
Print-O-Matic: version: 2.1.3, author: twinpictures, Auto-updates disabled
PublishPress Future: version: 2.7.3, author: PublishPress, Auto-updates disabled
Safe SVG: version: 2.0.1, author: 10up, Auto-updates disabled
Shortcode in Menus: version: 3.5.1, author: Gagan Deep Singh, Auto-updates disabled
Simple History: version: 3.2.0, author: P?r Thernstr?m (latest version: 3.3.0), Auto-updates disabled
Sydney Toolbox: version: 1.22, author: aThemes, Auto-updates disabled
TablePress: version: 1.14, author: Tobias B?thge, Auto-updates disabled
TablePress Extension: DataTables Buttons: version: 1.5, author: Tobias B?thge, Auto-updates disabled
TablePress Extension: Parse Shortcodes before Formulas: version: 1.0, author: Tobias B?thge, Auto-updates disabled
TablePress Extension: Single Cell Content Shortcode: version: 1.1, author: Tobias B?thge, Auto-updates disabled
Ultimate Addons for Gutenberg: version: 1.25.4, author: Brainstorm Force, Auto-updates disabled
Ultimate Member: version: 2.3.2, author: Ultimate Member, Auto-updates disabled
UpdraftPlus - Backup/Restore: version: 1.22.12, author: UpdraftPlus.Com, DavidAnderson, Auto-updates disabled
User Role Editor: version: 4.62, author: Vladimir Garagulya, Auto-updates disabled
wpDataTables: version: 4.2.1, author: TMS-Plugins, Auto-updates disabled
WP Mail SMTP: version: 3.4.0, author: WPForms, Auto-updates disabled
WP Rollback: version: 1.7.1, author: Impress.org, Auto-updates disabled
Zoom Search: version: 0.1.6000, author: Wrensoft, Auto-updates disabled
### wp-plugins-inactive (10) ###
Akismet Anti-Spam: version: 4.2.3, author: Automattic, Auto-updates disabled
Calculated Fields Form: version: 1.1.84, author: CodePeople, Auto-updates disabled
Child Theme Configurator: version: 2.5.9, author: Lilaea Media, Auto-updates disabled
Conditional Menus: version: 1.2.0, author: Themify, Auto-updates disabled
Gravity Forms MailChimp Add-On: version: 4.3, author: rocketgenius, Auto-updates disabled
Gravity Forms Sticky List: version: 1.5.2, author: 13pixar, Auto-updates disabled
GravityView: version: 2.12.1, author: GravityView, Auto-updates disabled
List Field Number Format for Gravity Forms: version: 1.6.5, author: Adrian Gordon, Auto-updates disabled
Shortcoder: version: 5.7, author: Aakash Chakravarthy, Auto-updates disabled
Velvet Blues Update URLs: version: 3.2.10, author: VelvetBlues.com, Auto-updates disabled
### wp-media ###
image_editor: WP_Image_Editor_GD
imagick_module_version: Not available
imagemagick_version: Not available
imagick_version: Not available
file_uploads: File uploads is turned off
post_max_size: 8M
upload_max_filesize: 8M
max_effective_size: 8 MB
max_file_uploads: 20
gd_version: bundled (2.1.0 compatible)
gd_formats: GIF, JPEG, PNG, WebP, BMP, AVIF, XPM
ghostscript_version: not available
### wp-server ###
server_architecture: Windows NT 10.0 AMD64
httpd_software: Apache/2.4.52 (Win64) PHP/8.1.3
php_version: 8.1.3 64bit
php_sapi: apache2handler
max_input_variables: 1000
time_limit: 180
memory_limit: 256M
max_input_time: 60
upload_max_filesize: 8M
php_post_max_size: 8M
curl_version: 7.77.0 OpenSSL/1.1.1m
suhosin: false
imagick_availability: false
pretty_permalinks: true
htaccess_extra_rules: true
### wp-database ###
extension: mysqli
server_version: 8.0.26
client_version: mysqlnd 8.1.1
max_allowed_packet: 4194304
max_connections: 151
### wp-constants ###
WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: C:\Webservices\HTTP\batman/wp-content
WP_PLUGIN_DIR: C:\Webservices\HTTP\batman/wp-content/plugins
WP_MEMORY_LIMIT: 40M
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_ENVIRONMENT_TYPE: Undefined
DB_CHARSET: utf8
DB_COLLATE: undefined
### wp-filesystem ###
wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable
### wp_mail_smtp ###
version: 3.4.0
license_key_type: lite
debug: No debug notices found.
lite_install_date: May 9, 2022 @ 7:01am