I’ve also run into something similar lately but was not able to get to the root cause. However, the symptom appears to be that rebar is pulling version 1.13.0 of pc from hex instead of the latest 1.15.0.
Since rebar does not lock plugins, I’m not sure what its mechanism is for discovery of “latest version” from hex that is causing it to grab 1.13.0.
For my own purposes, I was able to workaround this by changing my rebar.config like so
% rebar.config
{project_plugins, [{pc, "1.15.0"}]}.
My actual commit here for the curious
Unfortunately this workaround won’t be directly helpful to you since the rebar.config is not under your control.
