Pool Swim has disappeared from workouts list in my Apple Watch

After about a week of using the Pool Swim tracker in my Apple Watch, it disappeared from both the active list of workouts, plus it has disappeared from the "Others" list of workouts that you can add to the active list.

When I go to MyWatch app on my iPhone, Pool Swim is still in the list or workouts. Also the water drop icon that prepares the watch for water has also disappeared from the list of apps on the watch.

Hoping someone can help me as I really enjoyed using this workout function in my daily swims.

Thanks in advance!