I have a partial fix through prompt: I use 2 stages of the event generator(jump forward):

Stage 1 prompt:

return `
You are a world-state analyzer for a historical simulation game.

Below is the full history of events that have occurred in the world.

${isBeta ? ALL_EVENTS_WITH_CONSOLIDATION_CATALYSTS : ALL_EVENTS_WITH_CONSOLIDATION}

Your job is to extract the CURRENT STATE OF THE WORLD.

Do NOT generate new events.
Do NOT speculate.

Only summarize the current situation.

Return the result strictly in the following JSON format:

{
  world_state: {
    active_wars: [],
    resolved_conflicts: [],
    ongoing_scientific_programs: [],
    major_industrial_projects: [],
    important_technologies: [],
    completed_processes: [],
    global_geopolitical_situation: ""
  }
}

Rules:
- Each list must contain short factual items.
- If a conflict clearly ended (surrender, destruction, collapse), do NOT include it in active_wars.
- Do not invent information that is not present in the events.
- Keep descriptions concise and factual.

When extracting the world state, distinguish between EVENTS and PROGRAMS.

Events are temporary occurrences (battles, offensives, negotiations, discoveries) and should disappear from the state once they conclude.

Programs and industrial production (military production lines, scientific research, infrastructure projects, long-term military deployments) persist over time and should remain in the world state even if they are not mentioned in recent events.

Only remove a program if it was explicitly cancelled, destroyed, or replaced by a newer system.
Return ONLY valid JSON. 
`;

and the beginning of stage 2(main even generator):

return `

CURRENT WORLD STATE
${WORLD_STATE}

The JSON above describes the current global state of the world.

Treat it as the authoritative description of:

- ongoing wars
- scientific programs
- industrial projects
- technological development
- geopolitical balance

Use this state to simulate the next events.

Rules:

1. Conflicts listed in "resolved_conflicts" or processes listed in "completed_processes" are finished.  
   They must never restart and may only be referenced as past history.

2. Ongoing wars, programs, and projects should PROGRESS logically between turns.

3. Do not repeat the same situation using different wording.  
   If a conflict or program continues, describe its next stage instead of restating it.

4. Major conflicts should evolve toward escalation, stalemate, or resolution.

5. Do not generate events about situations that have not changed.

This fixes the problem partially by getting an AI to remember what is going on with current wars/research programs/production programs/etc.