Thanks for posting the link to the bug report at AHQ. I added my "Me too" to the list
The issue with Whims not registering has been bothering me for over a week. Only the whim in the first slot gets fulfilled if the Sim happens to be in the right place, at the right time, to be able to do whatever action the whim involves. I've noticed that whims in the second and third slots seem to only get fulfilled if the Sim completes one autonomously and fairly quickly after the whim appears.
A lot of my newer Sims are learning to paint while waiting for their gardens to get going so they spin a lot of whims regarding easy stuff involving painting and gardening. The whim bug is causing problems for my new Sims who are trying to build up points to buy the least expensive reward traits, like Frugal.