This bug will be resolved in the next update that we will release, we will update this article as soon as this update is available on the Play Store and AppStore!
It seems that when you obtain parts from the rewards of an event, these new parts aren't taken into account for the "Collect 85 parts" Daily challenge. If you happen to find other situations where parts you have obtained haven't been taken into account for the progress of this challenge, please do not hesitate to contact the support team to let us know about it!
More information on how to contact support can be found here: