Thank you for the reply and I appreciate your willingness to help.
Since we can’t roll back from hotfixes straight in the launcher, I went and visited Epic’s GitHub page and grabbed the 4.19.1 build, compiled it, ran the project from there, exported the height map, deleted the landscape component, saved the map, opened it with 4.19.2 and regenerated the landscape from there. Bam, works again.
Not the easiest or fastest way to get back the work because compile times are a pain, but compared to the days I spent designing the level, heck I’lI take it.