see xml instead of diagram inside devcontainer

[dvnicolasdh]

Hello, while inside a linux vscode 1.105.0 running devcontainer (build FROM ghcr.io/astral-sh/uv:$UV_VERSION AS uv FROM mcr.microsoft.com/vscode/devcontainers/base:$DEBIAN_VERSION), with "hediet.vscode-drawio" version 1.9.0 in the devcontainer installed (either via devcontainer.json, or via the Extensions Manager (Ctrl+Shift+X), opening a file "example.drawio" shows the "xml" content of the file.
P.S.: Test was done on Ubuntu 24.04.3 with docker-ce 28.5.1.
Note: if we re-open the folder in "local" mode (hence out of the devcontainer), we also have the plugin "hediet.vscode-drawio" install on the host computer, then "drawio then shows/draws the "example.drawio" diagram.