Emoji in textarea prevents field to save in entry and success message to show

[te-online]

Reproduction steps:

• Create a form with a textarea field, enable entries
• Write some text including an emoji to the textarea
• Submit the form
• Email notifications are sent, but success message is not shown and the entry is missing for the textarea field

Website Report

### wp-core ###

version: 6.4.1
site_language: en_US
user_language: en_US
timezone: Europe/Berlin
permalink: /%category%/%postname%/
https_status: true
multisite: true
user_registration: false
blog_public: 1
default_comment_status: undefined
environment_type: production
site_count: 2
network_count: 1
user_count: 2
dotorg_communication: true

### wp-dropins (1) ###

object-cache.php: true

### wp-plugins-active (10) ###

Advanced Custom Fields PRO: version: 6.2.3, author: WP Engine, Auto-updates disabled
Advanced Forms: version: 1.9.3.2, author: Phil Kurth (Hookturn), Auto-updates enabled
Classic Editor: version: 1.6.3, author: WordPress Contributors, Auto-updates enabled
Classic Widgets: version: 0.3, author: WordPress Contributors, Auto-updates disabled
Limit Login Attempts Reloaded: version: 2.25.26, author: Limit Login Attempts Reloaded, Auto-updates enabled
No Category Base (WPML): version: 1.3, author: Marios Alexandrou, Auto-updates enabled
Redis Object Cache: version: 2.5.0, author: Till Krüss, Auto-updates enabled
Statify: version: 1.8.4, author: pluginkollektiv, Auto-updates enabled
TinyPNG - JPEG, PNG & WebP image compression: version: 3.4.3, author: TinyPNG, Auto-updates enabled
WP Offload SES Lite: version: 1.6.6, author: Delicious Brains, Auto-updates enabled

### wp-media ###

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1691
imagemagick_version: ImageMagick 6.9.11-60 Q16 x86_64 2021-01-25 https://imagemagick.org
imagick_version: 3.6.0
file_uploads: 1
post_max_size: 1G
upload_max_filesize: 1G
max_effective_size: 1 GB
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
	imagick::RESOURCETYPE_TIME: 9.2233720368548E+18
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 5.15.0-88-generic x86_64
httpd_software: Apache/2.4.56 (Debian)
php_version: 8.0.30 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: 1G
php_post_max_size: 1G
curl_version: 7.74.0 OpenSSL/1.1.1w
suhosin: false
imagick_availability: true
pretty_permalinks: true
htaccess_extra_rules: true
current: 2023-11-19T12:07:49+00:00
utc-time: Sunday, 19-Nov-23 12:07:49 UTC
server-time: 2023-11-19T13:07:49+01:00

### wp-database ###

extension: mysqli
server_version: 10.11.5-MariaDB-1:10.11.5+maria~ubu2204
client_version: mysqlnd 8.0.30
max_allowed_packet: 16777216
max_connections: 151

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /var/www/html/wp-content
WP_PLUGIN_DIR: /var/www/html/wp-content/plugins
WP_MEMORY_LIMIT: 64M
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: true
WP_DEBUG_DISPLAY: false
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_ENVIRONMENT_TYPE: Undefined
WP_DEVELOPMENT_MODE: undefined
DB_CHARSET: utf8mb4
DB_COLLATE: undefined

### wp-filesystem ###

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

First, I thought this issue may be related to my database charset, but it looks to be correct. Any ideas why this is happening? I did notice that I can't save emojis in WordPress posts either, so maybe it is an issue with my setup after all?