Transmuter Wizard can't pick Resistence twice for the Transmuter's Stone even though that's explicitly allowed.

The level 10 Transmutation Wizard ability says

Level 10: Potent Stone

Your Transmuter’s Stone is more versatile. When you create your Transmuter’s Stone, you can choose up to two benefits. You can choose each option other than Resistance only once. If you choose Resistance twice, you must choose different damage types. You can change either or both benefits when you cast a Transmutation spell using a spell slot.

In addition, the following are now among your benefit options for Transmuter’s Stone.

However, I can only pick resistance once, then it's not allowed to be selected.