Functioning setup

module/data/regionBehavior/applyActiveEffect.mjs

@@ -0,0 +1,38 @@
+export default class DhApplyActiveEffect extends CONFIG.RegionBehavior.dataModels.applyActiveEffect {
+    static async #getApplicableEffects(token) {
+        const effects = await Promise.all(this.effects.map(fromUuid));
+        return (effects).filter(effect => !effect.system.targetDispositions.size || effect.system.targetDispositions.has(token.disposition));
+    }
+
+    static async #onTokenEnter(event) {
+        if ( !event.user.isSelf ) return;
+        const {token, movement} = event.data;
+        const actor = token.actor;
+        if ( !actor ) return;
+        const resumeMovement = movement ? token.pauseMovement() : undefined;
+        const effects = await DhApplyActiveEffect.#getApplicableEffects.bind(this)(event.data.token);
+        const toCreate = [];
+        for ( const effect of effects ) {
+        const data = effect.toObject();
+        delete data._id;
+        if ( effect.compendium ) {
+            data._stats.duplicateSource = null;
+            data._stats.compendiumSource = effect.uuid;
+        } else {
+            data._stats.duplicateSource = effect.uuid;
+            data._stats.compendiumSource = null;
+        }
+        data._stats.exportSource = null;
+        data.origin = this.parent.uuid;
+        toCreate.push(data);
+        }
+        if ( toCreate.length ) await actor.createEmbeddedDocuments("ActiveEffect", toCreate);
+        await resumeMovement?.();
+    }
+
+  /** @override */
+  static events = {
+    ...CONFIG.RegionBehavior.dataModels.applyActiveEffect.events,
+    [CONST.REGION_EVENTS.TOKEN_ENTER]: this.#onTokenEnter,
+  }; 
+}