before-send-fn not being executed during tracing events

[ianmuge]

Environment

How do you use Sentry?
Sentry SaaS (sentry.io) or self-hosted/on-premise (which version?)
self-hosted

Which SDK and version?
e.g: JavaScript 5.11.1, .NET 1.2.0
[io.sentry/sentry-clj "5.7.180"]
[io.sentry/sentry "5.7.4"]

Steps to Reproduce

on the init function

:before-send-fn (fn [event _] (.setServerName event "fred") event)

tracing events still don't have the servername modified

Expected Result

When the before send function is set in the initialisation step it should be considered for all tracing and exception events, in this simple case setting the server name as "fred"

Actual Result

The event is not modified for tracing events