Not sure where this should be logged as a bug, since I don't think it's specific to Rubymine. The Terraform/HCL plugin is not resolving local modules anymore. That is, RM highlights the block as having an issue and the tooltip says "Cannot locate module locally, unknown reason"
I saw at least a couple of other notes about this behavior on the plugin's review page.
RM gives you the option to "terraform get", which succeeds but doesn't change RM's ability to see the module. Terraform itself runs perfectly fine - can see/load all the necessary modules, etc.
I've had idea.log open, but I don't see any information about this problem showing up there. Happy to log a bug in YT, but not clear where that belongs. Thanks!