I suspect it is the same reason that some higher
end fish oil capsules are enteric coated. Fish oil
capsules tend to cause fishy tasting burping/reflux.
So the idea is at the beginning of the day one is
likely to remain upright and be active thus
reducing the odds of fishy reflux.

I'll suggest taking the FO caps with food and the food
with betaine HCL w/pepsin to enhance digestive
motility should go a long way in preventing this
if it is a problem.

It is not an especially good time at bedtime to eat or take oily
supplements as this especially in middle age and beyond of raising the
risk of nocturnal reflux and can contrigute to starting one down the
path
to gastroesophageal reflux along with the numerous other
risk factors such as weight gain, soda pop
use, aging, achlorhydria or its opposite, coffee, tea, a relaxed lower
esophageal sphincter, and shift work.

I think I nailed the answer ....the bat cracks and the ball
sails over the fence.....Trig