It’s most likely related to XPresso. We are aware of it and hopefully there will be a fix soon.
One workaround is to disable expression execution in scene settings: https://forum.corona-renderer.com/ IR and Xpresso issue #msg237151
Other threads:
https://forum.corona-renderer.com/ IR stuck in Parding and Geometry
https://forum.corona-renderer.com/ Interactive Rendering Bug in Corona 14 Update 1 (C4D 2025)