Missing .png images produce 404 error in web server log

[inetuka]

We are using 7.0.23 on Debian 12 behind an nginx proxy. I was testing a fail2ban filter rule to mitigate excessive 404 errors by site probing. I came about three files that seem to be missing from Zabbix that do produce 404 errors under normal access. The folder images and content just does not exist anymore. How can/should this be corrected?
Best regards, Udo

... "GET /assets/styles/vendors/Leaflet/images/layers.png HTTP/2.0" 404 266 "https://zabbix.server.com/" ...
... "GET /assets/styles/vendors/Leaflet/images/layers-2x.png HTTP/2.0" 404 266 "https://zabbix.server.com/" ...
... "GET /assets/styles/vendors/Leaflet/images/marker-icon.png HTTP/2.0" 404 266 "https://zabbix.server.com/" ...

/usr/share/zabbix# grep -R "layers.png" *
assets/styles/vendors/Leaflet/leaflet.css: background-image: url(images/layers.png);

/usr/share/zabbix# grep -R "layers-2x.png" *
assets/styles/vendors/Leaflet/leaflet.css: background-image: url(images/layers-2x.png);

/usr/share/zabbix# grep -R "marker-icon.png" *
assets/styles/vendors/Leaflet/leaflet.css: background-image: url(images/marker-icon.png);
js/vendors/Leaflet/leaflet.js: iconUrl: 'marker-icon.png'

/usr/share/zabbix# find . -name layers.png
/usr/share/zabbix# find . -name layers-2x.png
/usr/share/zabbix# find . -name marker-icon.png

[cyber]

Those do not exist on fresh nstalled instance also, so I would assume they do not need to be there...
no 404-s in our log...