This issue is not reproducible across several different systems in-house, following multiple attempts using various workflows reported on the associated Esri Community thread. If there is a reliable demonstration that can be reproduced in-house, the case is to be opened again.
For a more elaborate closure statement on Esri Community visit: https://community.esri.com/t5/arcgis-pro-ideas/do-not-activate-arcgis-pro-window-while-loading-if/idc-p/1266701/highlight/true#M23708