The build instructions used for the CaptivePortal process did not properly set library validation state, leading to crashes in some configurations.
<rdar://problem/94844399>
This was actually fixed under this: rdar://89925654
The fix was made here: Pull request: https://github.com/WebKit/WebKit/pull/1293 And committed: Committed r295304 (251346@main): https://commits.webkit.org/251346@main