TruffleAdapter.hover(...) is always null

[orat]

DSL4GA_LSP package:
Test HoverTest failed because
Future future = truffleAdapter.hover(uri, line, column);
Hover hover = future.get(); // FIXME hover.getRange()==null

It looks that there is a bug in the language itself.

[orat]

It is not hover==null
it is hover.getRange()==null, so if you you hover the cursor over a character of a symbol you do not get the position ranges of the symbol.