Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/react

SDK Version

8.55.0

Framework Version

React 19.1.0

Link to Sentry event

https://rubrikinc.sentry.io/explore/discover/trace/7bdadd12bb354a6b9b49cd265bb6b866/?dataset=transactions&field=title&field=project&field=user.display&field=timestamp&name=All%20Errors&node=span-8602bdf238eefb8a&query=transaction%3A%2A%2F%2A%2F3%2F%2A&queryDataset=transaction-like&sort=-timestamp&source=discover&statsPeriod=30d&timestamp=1755069450&yAxis=count%28%29

Reproduction Example/SDK Setup

https://github.com/rk-1203/sentry-router-simple/tree/route-config-and-sentry-v9

Steps to Reproduce

This issue is happening when we have lazy-loaded routes in our application, and when Sentry tries to capture the page load transaction for that route.

This issue is fixed now in v10.3.0. We are asking for a backport to 8.55.0.
This might be the PR where it's fixed - #17277

Expected Result

The transaction should look like

• /part1/part2/:id
• /part1/part2/:id/:anotherId
• /part1/part2/:id/:anotherId/:someAnotherId

Actual Result

Current transaction looks like

• /part1/part2/*
• /*