And, of course, the inevitable fix.

Author: vanwamelen

src/games/biscuit.ts

@@ -1213,7 +1213,7 @@ export class BiscuitGame extends GameBase {
 
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
     public serialize(opts?: {strip?: boolean, player?: number}): string {
-        const json = JSON.stringify(this.state(), replacer);
+        const json = JSON.stringify(this.state(opts), replacer);
         const compressed = pako.gzip(json);
 
         return Buffer.from(compressed).toString("base64") as string;