Amazon warehouses can get up to 100 degrees in the summer so Amazon places restrictions on what can be sent to their warehouses from May 1st until September 30th.
If you have a lot temperature sensitive items at fulfillment centers now is the time to sell or place removal orders if you aren't able to sell by the end of the month.
You can't sell FBA from May through September but you can sell FBM and without the competition of FBA sellers, FBM can be extra lucrative during these months as long as you take shipping costs into account.
Doing well on Amazon is often about finding inefficiencies in the marketplace and exploiting them. Sure this is more annoying and more work than FBA but use it to your advantage and you can sell a lot of chocolate. just make sure it doesn't melt on the way....