A warning message (see complete one on screenshot):

imagecreatefromstring(): gd-png: libpng: .... iCPP: knonw incorrect sRGB profile

is displayed when try to edit every map, but it doesn’t affect the operation of the editor.

The warning is shown when Zabbix frontend is built from dockerfile from site https://github.com/zabbix/zabbix-docker/tree/6.0.18/Dockerfiles/web-apache-mysql/alpine.
Checked that on versions 6.0.8 and 6.0.18.

Containers run from downloaded images from dockerhub have no problems.