It seems we are not calling the update-libs/flatpak/jhbuild step before building webkit without patch on the EWS for GTK and WPE
Pull request: https://github.com/WebKit/WebKit/pull/20504
Committed 270769@main (04402fa2fe1d): <https://commits.webkit.org/270769@main> Reviewed commits have been landed. Closing PR #20504 and removing active labels.
<rdar://problem/118454883>