Context Map type disappears when applying AR

[stefan-ka]

Describe the bug After the application of an AR, the attribute type is no longer specified on the context map.

To Reproduce Steps to reproduce the behavior:

1. Specify type on context map
2. Apply any AR
3. Type is no longer specified

Expected behavior The type should be unparsed as all other attributes.

[stefan-ka]

Seems to be a weird Xtext behavior regarding unordered groups.

In our language this only happens if the type is specified after the state, like this:

In this case, applying an AR (any model change) removes the type.

I haven't found a solution yet, but a workaround is to write the attributes in the order they are specified in the grammar. In our case, specify the type before the state like this:

In this case everything works fine.