Sims 4 Milestones Bug

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Often (50% - 99%)
What is your current game version number? 1.0.728.0
What expansions, game packs, and stuff packs do you have installed? All other then star wars
Steps: How can we find the bug ourselves? No idea as it doesn't always appear
What happens when the bug occurs? My sims family can't load I will try to load the family and the loading screen will just go on forever. I get a final expecting saying developmental tracker expecting raised whilst processing zone spin up sequence object not found 0x6944f70d. I cheated removed the sim, the family loaded, I then added the sim back to the family, all milestones had disappeared and then game crashed
What do you expect to see? My families to load and have all milestones they have earned
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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Even with my mods all removed, the issue still occurs.

<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>dd4c8137606a29046476668b</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2023-05-30 22:13:45</createtime><buildsignature>Local.Unknown.Unknown.1.98.127.1030-1.200.000.593.Release</buildsignature><categoryid>developmental_milestone_tracker.py:1106</categoryid><desyncid>dd4c8137606a29046476668b</desyncid><systemconfig/><screenshot/><desyncdata>Exception raised while processing zone spin up sequence: 'Object not found: 0x6944f70d' (KeyError: 'Object not found: 0x6944f70d')&#13;&#10;Traceback (most recent call last):&#13;&#10;&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 118, in wrapped&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 114, in finally_wrap&#13;&#10; File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 157, in wrapper&#13;&#10; File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 175, in wrapper&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 371, in c_api_client_connect&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 599, in do_zone_spin_up&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1643, in update&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 792, in on_update&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 1007, in on_all_sims_spawned&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 1059, in _set_zone_state&#13;&#10; File "T:\InGame\Gameplay\Scripts\Core\sims4\callback_utils.py", line 158, in __call__&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 274, in start_milestone_tracker&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 724, in _activate_available_milestones&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 561, in activate_milestone&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 315, in process_evaluation&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1195, in send_all_milestones_update_to_client&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1106, in _get_milestone_update_msg&#13;&#10;KeyError: 'Object not found: 0x6944f70d'rtim=0&#13;&#10;Client Session Time: 19.56&#13; &#10;Num Save Errors: 0&#13; &#10;Num Load Errors: 0&#13; &#10;Current Game State: 0x96d01090&#13; &#10;LoadingScreenActiveFlag: 1&#13; &#10;Origin Version: 12,186,0,5443&#13; &#10;Modded: True&#13; &#10;SystemInfo: Windows 10 10.0.19045 GPU: NVIDIA GeForce RTX 2060 nvldumdx.dll 31.0.15.3168, GUID: D7B71E3E-5C48-11CF-0E7F-073F0EC2D235&#13; &#10;</desyncdata></report>
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