We used to have clear error reporting in this case, but apparently it has bit rotted.
<rdar://problem/113034512>
Pull request: https://github.com/WebKit/WebKit/pull/19020
Committed 269282@main (bcd2edf42d7f): <https://commits.webkit.org/269282@main> Reviewed commits have been landed. Closing PR #19020 and removing active labels.