[Bug]: Statically defined loader isn't running in parallel with the lazy function

[erism]

What version of React Router are you using?

6.9.0

Steps to Reproduce

Crate a route with lazy and loader definition.
Add delays and console logs to both lazy and loader definitions in order to inspect running order.

Example codesandbox

Expected Behavior

Loader function should run in parallel with lazy according to the docs:
https://reactrouter.com/en/main/route/lazy#statically-defined-properties

According to the example codesandbox, running order should be (visible on console):
-Lazy import begin
-loader begin
-loader end
-Lazy import end

Actual Behavior

Loader function starts after lazy function finishes. Running order is:
-Lazy import begin
-Lazy import end
-loader begin
-loader end

[brophdawg11]

Ah this is actually the same root cause as #10194 and was fixed by #10201. That's available in 6.10.0-pre.2 currently and should be out in a stable 6.10.0 shortly.

As a note, it's only an issue for lazy routes on initial load. They do run in parallel on subsequent client-side navigations.

[brophdawg11]

I think this should be resolved in 6.10.0 now