Unclear behaviour on saving empty post

[cadic]

The problem

When saving new post with empty title and content in Classic Editor, the post is reported as "published" but never appear in post list. The "View post" link displays 404 page.

Video

save-empty-post.mp4

WordPress environment

wp-core

version: 6.0
site_language: en_US
user_language: en_US
timezone: +00:00
permalink: undefined
https_status: false
multisite: false
user_registration: 0
blog_public: 1
default_comment_status: open
environment_type: local
user_count: 1
dotorg_communication: true

wp-paths-sizes

wordpress_path: /var/www/html
wordpress_size: 47.20 MB (49497528 bytes)
uploads_path: /var/www/html/wp-content/uploads
uploads_size: 0.00 B (0 bytes)
themes_path: /var/www/html/wp-content/themes
themes_size: 11.53 MB (12089471 bytes)
plugins_path: /var/www/html/wp-content/plugins
plugins_size: 316.14 KB (323727 bytes)
database_size: 2.13 MB (2228224 bytes)
total_size: 61.17 MB (64138950 bytes)

wp-active-theme

name: Twenty Twenty-Two (twentytwentytwo)
version: 1.2
author: the WordPress team
author_website: https://wordpress.org/
parent_theme: none
theme_features: core-block-patterns, post-thumbnails, responsive-embeds, editor-styles, html5, automatic-feed-links, block-templates, widgets-block-editor, wp-block-styles, editor-style
theme_path: /var/www/html/wp-content/themes/twentytwentytwo
auto_update: Disabled

wp-themes-inactive (2)

Twenty Twenty: version: 2.0, author: the WordPress team, Auto-updates disabled
Twenty Twenty-One: version: 1.6, author: the WordPress team, Auto-updates disabled

wp-plugins-active (1)

Classic Editor: version: 1.6.2, author: WordPress Contributors, Auto-updates disabled

wp-plugins-inactive (2)

Akismet Anti-Spam: version: 4.2.4, author: Automattic, Auto-updates disabled
Hello Dolly: version: 1.7.2, author: Matt Mullenweg, Auto-updates disabled

wp-media

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1691
imagemagick_version: ImageMagick 6.9.11-60 Q16 aarch64 2021-01-25 https://imagemagick.org
imagick_version: 3.6.0
file_uploads: File uploads is turned off
post_max_size: 8M
upload_max_filesize: 2M
max_effective_size: 2 MB
max_file_uploads: 20
imagick_limits:
imagick::RESOURCETYPE_AREA: 122 MB
imagick::RESOURCETYPE_DISK: 1073741824
imagick::RESOURCETYPE_FILE: 786432
imagick::RESOURCETYPE_MAP: 512 MB
imagick::RESOURCETYPE_MEMORY: 256 MB
imagick::RESOURCETYPE_THREAD: 1
imagemagick_file_formats: 3FR, 3G2, 3GP, AAI, AI, APNG, ART, ARW, AVI, AVIF, AVS, BGR, BGRA, BGRO, BIE, BMP, BMP2, BMP3, BRF, CAL, CALS, CANVAS, CAPTION, CIN, CIP, CLIP, CMYK, CMYKA, CR2, CR3, CRW, CUR, CUT, DATA, DCM, DCR, DCX, DDS, DFONT, DNG, DPX, DXT1, DXT5, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, ERF, FAX, FILE, FITS, FRACTAL, FTP, FTS, G3, G4, GIF, GIF87, GRADIENT, GRAY, GRAYA, GROUP4, H, HALD, HDR, HEIC, HISTOGRAM, HRZ, HTM, HTML, HTTP, HTTPS, ICB, ICO, ICON, IIQ, INFO, INLINE, IPL, ISOBRL, ISOBRL6, J2C, J2K, JBG, JBIG, JNG, JNX, JP2, JPC, JPE, JPEG, JPG, JPM, JPS, JPT, JSON, K25, KDC, LABEL, M2V, M4V, MAC, MAGICK, MAP, MASK, MAT, MATTE, MEF, MIFF, MKV, MNG, MONO, MOV, MP4, MPC, MPG, MRW, MSL, MTV, MVG, NEF, NRW, NULL, ORF, OTB, OTF, PAL, PALM, PAM, PATTERN, PBM, PCD, PCDS, PCL, PCT, PCX, PDB, PDF, PDFA, PEF, PES, PFA, PFB, PFM, PGM, PGX, PICON, PICT, PIX, PJPEG, PLASMA, PNG, PNG00, PNG24, PNG32, PNG48, PNG64, PNG8, PNM, POCKETMOD, PPM, PREVIEW, PS, PS2, PS3, PSB, PSD, PTIF, PWP, RADIAL-GRADIENT, RAF, RAS, RAW, RGB, RGBA, RGBO, RGF, RLA, RLE, RMF, RW2, SCR, SCT, SFW, SGI, SHTML, SIX, SIXEL, SPARSE-COLOR, SR2, SRF, STEGANO, SUN, TEXT, TGA, THUMBNAIL, TIFF, TIFF64, TILE, TIM, TTC, TTF, TXT, UBRL, UBRL6, UIL, UYVY, VDA, VICAR, VID, VIDEO, VIFF, VIPS, VST, WBMP, WEBM, WEBP, WMV, WPG, X, X3F, XBM, XC, XCF, XPM, XPS, XV, XWD, YCbCr, YCbCrA, YUV
gd_version: bundled (2.1.0 compatible)
gd_formats: GIF, JPEG, PNG, WebP, BMP
ghostscript_version: 9.53.3

wp-server

server_architecture: Linux 5.10.47-linuxkit aarch64
httpd_software: Apache/2.4.53 (Debian)
php_version: 7.4.29 64bit
php_sapi: apache2handler
max_input_variables: 1000
time_limit: 30
memory_limit: 128M
admin_memory_limit: 256M
max_input_time: -1
upload_max_filesize: 2M
php_post_max_size: 8M
curl_version: 7.74.0 OpenSSL/1.1.1n
suhosin: false
imagick_availability: true
pretty_permalinks: true
htaccess_extra_rules: false

wp-database

extension: mysqli
server_version: 10.8.3-MariaDB-1:10.8.3+maria~jammy
client_version: mysqlnd 7.4.29
max_allowed_packet: 16777216
max_connections: 151

wp-constants

WP_HOME: http://localhost:8888/
WP_SITEURL: http://localhost:8888/
WP_CONTENT_DIR: /var/www/html/wp-content
WP_PLUGIN_DIR: /var/www/html/wp-content/plugins
WP_MEMORY_LIMIT: 40M
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: true
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: true
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_ENVIRONMENT_TYPE: local
DB_CHARSET: utf8
DB_COLLATE: undefined

wp-filesystem

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

[azaozz]

Sounds like this is a problem with the (old) Edit Post screen, not with this plugin. Classic Editor plugin only enables the use of the old editor, it doesn't affect how it works.

If this still happens and has been tested with all other plugins disabled, and it seems to be an old bug on the Edit Post screen, please feel free to open a Trac ticket with the full description and how to reproduce it.