Having them set as "internal" puts them in the legacy +[WKPreferences _internalDebugFeatures] interface, which causes them to be reset unnecessarily.
rdar://103922126
Pull request: https://github.com/WebKit/WebKit/pull/8511
Committed 258776@main (b47a5bb9772a): <https://commits.webkit.org/258776@main> Reviewed commits have been landed. Closing PR #8511 and removing active labels.