The crash while scanning happens after opening both, the AU and VST version of NI Replica after each other. Renoises plugin scan first searches for AU plugins, then VST plugins, so the VST version of Replika will crash down when getting unloaded. This happens in other hosts as well and very very likely is a bug in the plugin.
When loading/saving songs with multiple instances of Replika, some other weirdthings are happening too. Plugin instances start “corrupting” memory then it seems. Hard to debug, hard to say what exactly could be the problem.Should report that to NI as well, so they can have a closer look into this.