maybe this'll work better?

Author: Absolucy

code/datums/changelog/changelog.dm

@@ -8,18 +8,18 @@
 	ui = SStgui.try_update_ui(user, src, ui)
 	if (!ui)
 		ui = new(user, src, "Changelog")
+		ui.set_autoupdate(FALSE)
 		ui.open()
 
 /datum/changelog/ui_act(action, list/params, datum/tgui/ui, datum/ui_state/state)
 	. = ..()
 	if(.)
 		return
 	if(action == "get_month")
-		var/datum/asset/changelog_item/changelog_item = changelog_items[params["date"]]
-		if (!changelog_item)
-			changelog_item = new /datum/asset/changelog_item(params["date"])
-			changelog_items[params["date"]] = changelog_item
-		return ui.send_asset(changelog_item)
+		return ui.send_asset(get_changelog_asset(params["date"]))
+
+/datum/changelog/ui_assets(mob/user)
+	return list(get_changelog_asset(time2text(world.realtime, "YYYY-MM")))
 
 /datum/changelog/ui_static_data()
 	var/list/data = list( "dates" = list() )
@@ -30,3 +30,6 @@
 		data["dates"] = list(archive_date) + data["dates"]
 
 	return data
+
+/datum/changelog/proc/get_changelog_asset(date) as /datum/asset/changelog_item
+	return changelog_items[date] ||= new /datum/asset/changelog_item(date)