as I said above: I have the same problem when trying to load Gemma as a subordinate character (I didn't experiment on Geralt because it's logical that he is the master and not the servant), you have Geralt in the loading scene, so it happens like in my screenshot, the number of characters doesn't matter, even just 2 characters on any map, the modified version from the first post, there is no such problem on the version without mods
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I forgot to mention the system: 20 thread processor overclocked to 3.5, 64 RAM, and 2070s video