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I opened both drawings using AutoCAD 2019. The first drawing posted had 11 errors and required recovery. There were also proxy objects. I turned off the viewport to discover that all annotation was in the layout. I checked display as plotted because yellow on white was giving me a headache. I turned on the viewport and tried mirroring just about any annotative object. There was no problem selecting any f the resulting mirrored objects whether or not the original was deleted. Could there be a memory issue at your end or a missing software update? The drawings are relatively large for their content. The purged version was half the size. The floor is oddly about 232' below the ucs world origin. I doubt any of that relates to your problem. Do you have any third party customizations runing?
Just a thought. If I'd left the objects at yellow, I doubt that I could tell that the objects were higlighted when selected. Do you by any chance have your grip display off?