The solution (add
bUsePrecompiled = trueto plugin build.cs files) seems to have worked for me. I still feel that something is off as this shouldn’t be necessary with Marketplace installs.
Thank you! At least we have a workaround now; works for me too. I won’t mark this as the solution yet as there’s clearly something wrong somewhere. I’m not sure how one could get Epic’s attention, hopefully they have staff on the forums.