Steps to reproduce:

1. Install Linux version vangers_1_45_44317.sh from GOG.com.
2. Clone this repository at commit 22accbb (current master branch at the time of writing) into ./Vangers
3. Build the game and copy data files with this script:

#!/usr/bin/env bash
cmake -B build Vangers
cmake --build build -j2
rm -fr safe_place
mkdir safe_place
cp -r "$HOME/GOG Games/Vangers/game/data"/* safe_place
cp -r ./Vangers/data/resource safe_place
cp build/src/vangers safe_place

4. cd safe_place and run ./vangers

Menus work, but the world is not rendered:

The problem is reproducible both with Wayland and Xorg.