To a bowl with warm water, add in the corn husks. Make sure all husks are fully covered with the water. Place something slightly heavy on top of the husks so they remain submerged in the water. Let the husks sit in the water for at least 2 hours or until they've softened up and are pliable.
To a bowl, add in the white rice flour, all purpose flour, baking powder, salt, and ground cinnamom. Stir to combine. Set aside.
Using a stand mixer set at speed level 2, mix the unsalted butter with the sugar for 3 minutes or until it reaches a creamy texture. If using a hand held mixer, mix for 8 minutes approximately, or until it reaches a creamy texture.
Add in to the mixer bowl the sweet condensed milk and the vanilla extract. Mix for 1 minute so it combines with the butter mixture.
To the mixer bowl, add in the eggs one by one slowly, scraping down the sides while mixing at a low speed level to avoid curdling.
Incorporate the dry ingredients (white rice flour, all purpose flour, baking powder, salt, and ground cinnamom) and pecans to the mixing bowl. Stir by hand with a spatula to combine.
Add in the evaporated milk and continue stirring by hand until well combined for one more minute.
Remove the husks from the water. Dry up with a kitchen towel to remove any excess water.
For the filling, spoon two tablespoons of the mixture into the corn husk and spread out. Depending on the size of the corn husk, leave about 1 -1 ½ inch of space between the masa mixture and the top and bottom of the corn husk. If you have any tears in the corn husks, use an extra piece of corn husk to patch the tear.
Add 2 or 3 pineapple chunks to the center of the tamal.
For the folding, fold the sides of the corn husks so they overlap the filling and the narrower part of the husk closes upwards.
To a tamalera or a tall pot with a steamer basket set on the bottom, add in enough water so that it almost touches the bottom of the steamer basket, but making sure that the water does not touch the steamer basket. Bring the water to a boil then reduce the heat to medium to maintain a simmer.
Place a layer of corn husks on top of the steamer basket.
Sit on top of this layer the tamales standing up with the folded end of the husk towards the bottom of the pot. Do not overcrowd the pot so the tamales have some room to expand.
Cover the tamales with another layer of corn husks or a kitchen towel to keep the water from evaporating too quickly. Cover the pot with a lid.
Steam the tamales for approximately 1 ¼ hr - 1 ½ hr.
To check for doneness ,pull a tamal out of the pot with kitchen tongs. Open up the tamal. If the tamal pulls away easily from the corn husk, they are done. If the masa is still sticking to the husk, rewrap the tamal, place it back in the pot, cover and let them cook for 10 more minutes.
Let the tamal rest for 10 minutes after been ready so they firm up a bit.