Icons of module level variables not rendering in Sequence Diagram

[f-schnabel]

Description:
The icons of the clients are not rendered if the client is not defined in the current scope.
I attached a stripped down example from https://ballerina.io/ (one with local, one with module level variable).

Module level:

Local:

Steps to reproduce:

Affected Versions:

OS, DB, other environment details and versions:

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