Fully qualified name not accepted inside `start[...]`

[PieterOlivier]

Describe the bug

When calling parse(start[...], source), I am not able to specify a fully qualified name inside the square brackets.

To Reproduce

sandbox/Syntax.rsc:

module sandbox::Syntax

start syntax Person = "person";

layout Layout = [\ \n\t\r]* !>> [\ \n\t\r\n];

sandbox/Parse.rsc:

module sandbox::Parse

import ParseTree;

import sandbox::Syntax;

Person parsePerson1(str source) = parse(#Person, source);
Person parsePerson2(str source) = parse(#sandbox::Syntax::Person, source);
Person parsePerson3(str source) = parse(#start[Person], source).top;
Person parsePerson4(str source) = parse(#start[sandbox::Syntax::Person], source);

PS C:\Users\pieter\sandbox> java -jar ..\rascal\rascal-shell-stable.jar
Version: 0.33.8
INFO: detected |lib://rascal| at |jar+file:///C:/Users/pieter/rascal/rascal-shell-stable.jar!/|
rascal>import sandbox::Parse;
Loading module |file:///C:/Users/pieter/sandbox/src/main/rascal/sandbox/Parse.rsc|
Warning: Could not load sandbox::Parse due to: Parse error at |prompt:///|(0,22,<1,0>,<1,22>)
Parse error
at file:///C:/Users/pieter/sandbox/src/main/rascal/sandbox/Parse.rsc offset=325 length=1 begin=10:47 end=10:48
        at org.rascalmpl.parser.gtd.SGTDBF.parse(SGTDBF.java:1197)
        at org.rascalmpl.parser.gtd.SGTDBF.parse(SGTDBF.java:1235)
...

In VS Code, a parse error is shown on the parsePerson4 line on the s from sandbox.

When the parsePerson4 line is removed from sandbox/Parse.rsc everything works fine. All three remaning parsePerson functions work as expected.