All Backslashes are being removed from the event content

Hello,

Suddenly all backslashes were removed from the contents of the event and I cannot add them back to the contents.

Can you help me to find the reason?

Some log below:

THE EVENTS CALENDAR - VIEW V2
Templates introduced or updated with this release (5.11.0):
event-status/status-label.php
event-status/single/event-statuses-container/postponed-status.php
event-status/single/event-statuses-container/canceled-status.php
event-status/single/event-statuses-container.php
event-status/status-label/canceled-label.php
event-status/status-label/postponed-label.php

List of Plugins
Pods – Custom Content Types and Fields version 2.8.6 by Pods Framework Team (https://pods.io/about/)
The Events Calendar version 5.11.0 by The Events Calendar (https://evnt.is/1x)
Admin Menu Editor version 1.10 by Janis Elsts (https://w-shadow.com/blog/)
Akismet Anti-Spam version 4.2.1 by Automattic (https://automattic.com/wordpress-plugins/)
Activity Log version 2.8.1 by Activity Log Team (https://activitylog.io/?utm_source=wp-plugins&utm_campaign=author-uri&utm_medium=wp-dash)
EditorsKit version 1.32.1 by Extendify (https://extendify.com/)
Email Address Encoder version 1.0.22 by Till Krüss (https://till.im/)
Event List version 0.8.6 by mibuthu (https://www.ads-software.com/plugins/event-list/)
Getwid version 1.7.7 by MotoPress (https://motopress.com/)
Site Kit by Google version 1.46.0 by Google (https://opensource.google.com)
Health Check & Troubleshooting version 1.4.5 by The www.ads-software.com community (https://www.ads-software.com/plugins/health-check/)
Jetpack version 10.3 by Automattic (https://jetpack.com)
Nginx Helper version 2.2.2 by rtCamp (https://rtcamp.com)
Particle Background WP version 2.0.0 by Ryan Novotny (https://particlebackground.com)
Regenerate Thumbnails version 3.1.5 by Alex Mills (Viper007Bond) (https://alex.blog/)
Registrations for The Events Calendar version 2.7.8 by Roundup WP (https://roundupwp.com)
RSS Enhancements for The Events Calendar version 1.1.0 by Room 34 Creative Services, LLC (https://room34.com)
Simple Mathjax version 2.0.1 by Samuel Coskey, Peter Krautzberger, Christian Lawson-Perfect (https://boolesrings.org)
Speed Booster Pack version 4.3.4.2 by Optimocha (https://optimocha.com)
The Events Calendar Category Colors version 6.7.1 by Andy Fragen, Barry Hughes (https://thefragens.com)
The Events Calendar Shortcode & Block version 2.5 by Event Calendar Newsletter (https://eventcalendarnewsletter.com/the-events-calendar-shortcode)
The Events Calendar version 5.11.0 by The Events Calendar (https://evnt.is/1x)
The Events Calendar Extension: Events Control version 1.2.0 by Modern Tribe, Inc. (https://m.tri.be/1971)
The Events Calendar Extension: Link Venues to Website URLs version 1.0.0 by Modern Tribe, Inc. (https://m.tri.be/1971)
The Events Calendar Extension: Speaker Linked Post Type version 1.0.1 by Modern Tribe, Inc. (https://m.tri.be/1971)
Ultimate Addons for Gutenberg version 1.25.2 by Brainstorm Force (https://www.brainstormforce.com)
Wordfence Security version 7.5.7 by Wordfence (https://www.wordfence.com/)
Yoast SEO version 17.7 by Team Yoast (https://yoa.st/1uk)
WP Extended Search version 2.0.3 by 5um17 (https://www.secretsofgeeks.com)
Smush version 3.9.2 by WPMU DEV (https://profiles.www.ads-software.com/wpmudev/)
Embed Plus for YouTube – Embed a YouTube Gallery, Channel, Playlist, Live Stream, Facade version 14.0.1.1 by Embed Plus for YouTube Team (https://www.embedplus.com)
Network Plugins

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