Exception Groups are not displayed fully

[Zomatree]

when using exception groups the sub-exceptions are not printed out when the group is raised.

Reproduction

raise ExceptionGroup("my error group", [Exception("a"), Exception("b")])

Output

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ExceptionGroup: my error group (2 sub-exceptions)

Expected Output

  + Exception Group Traceback (most recent call last):
  |   File "<stdin>", line 1, in <module>
  | ExceptionGroup: my error group (2 sub-exceptions)
  +-+---------------- 1 ----------------
    | Exception: a
    +---------------- 2 ----------------
    | Exception: b
    +------------------------------------