Posted on the #unreal channel but putting that here too as it seems like big limitation of the current plugin.
Metahumans seems to be working fine in editor but as soon as I want to render an image sequence through the (legacy) movie render queue all hairs are gone. The highres screenshot (F9, F10) work so worst comes worst, adapting the plugin to use that to render the image sequence instead of the movie queue could be a workaround.
Here a link to the post in the channel for more info.
#🔵┃unreal message