Fix a couple of errors. Make roll dialog verbiage clearer.

module/sheets/mixins/typed-skill-mixin.js

@@ -6,6 +6,7 @@ import {
 } from "../../profession/constants.js";
 
 const { renderTemplate } = foundry.applications.handlebars;
+const { ForcedDeletion } = foundry.data.operators;
 
 /**
  * @param {string} [selectedGroup]
@@ -39,7 +40,13 @@ export default function TypedSkillMixin(Base) {
           });
           break;
         case "delete":
-          this.actor.update({ [`system.typedSkills.-=${typedskill}`]: null });
+          this.actor.update({
+            system: {
+              typedSkills: {
+                [typedskill]: new ForcedDeletion(),
+              },
+            },
+          });
           break;
         default:
           break;

module/utils/world-migration.js

@@ -1,5 +1,7 @@
 import DG from "../config/index.js";
 
+const { ForcedDeletion } = foundry.data.operators;
+
 const MIGRATION_VERSION = 2;
 const ACTOR_TYPES_WITH_SKILLS = ["agent", "npc", "unnatural"];
 const OBSOLETE_WORLD_SETTINGS = [
@@ -41,8 +43,12 @@ export default async function runWorldMigration() {
   for (const actor of actors) {
     if (actor.system.skills?.ritual) {
       await actor.update({
-        "system.skills.-=ritual": null,
-        "system.schemaVersion": MIGRATION_VERSION,
+        system: {
+          skills: {
+            ritual: new ForcedDeletion(),
+          },
+          schemaVersion: MIGRATION_VERSION,
+        },
       });
       migratedActors += 1;
     }