This was caused by the patch from bug #170553
Created attachment 397996 [details] Patch Tentative fix. This was a silly screwup on my side due to landing the patch for bug #170553 with a last minute change to accomodate for GTK4 without waiting for the EWS to run.
Committed r260923: <https://trac.webkit.org/changeset/260923> All reviewed patches have been landed. Closing bug and clearing flags on attachment 397996 [details].