The culprit was the gameconfig.xml . This file acted as the gatekeeper, telling the game how much memory to allocate for cars, peds, and objects. The vanilla file from Rockstar was designed for a standard experience, not the chaotic, expanded world had built.
version (The Cayo Perico Heist update), a custom gameconfig.xml is essential for players who want to install numerous add-on mods, such as vehicles or map extensions, without the game crashing on the loading screen. Core Requirements gta 5 gameconfig 1.0.2189