Investigate the Dockerfile and font configuration in the repository (huan/docker wechat). Check if Chinese fonts like Noto Sans CJK are installed. Look at comments in issue #30 for potential solutions. Consider adding a font configuration step to the Dockerfile to support Chinese display.
中文显示正常,输入中文不能正常显示(方块) · huan/docker-wechat#30 | Good First Issue