export from gmpl to gpml does not preserve shape of unknown elements
GPML file: [WP4523_108086.gpml](/uploads/e6aca2b66b3fc82c47fa77bf0f824a93/WP4523_108086.gpml)
https://pg-sandbox.uni.lu/minerva/index.xhtml?id=WP4523_108086
exported file: [model-3.gpml](/uploads/71905151b9bada39627d0526aba503e9/model-3.gpml)

issue