Currently we are doing experiment using Amplitude ID as our bucketing key. We learned from https://help.amplitude.com/hc/en-us/articles/115003135607-Track-unique-users-in-Amplitude#h_4caf2577-336a-4b32-8a6a-c7245b5f2364 that a user would be assigned to same Amplitude ID after anonymous events. However, after we did some tests, the actual behavior was Amplitude would create a new Amplitude ID and than merged them. It may cause variant jumping when the first a anonymous user logging in. How can we solve this problem?