Steps to reproduce

1. press the Crazy Vertical Transition

Expected results

There shouldn't be any sudden change during the page transition

Actual results

first route suddenly change before the push starts

Code sample

https://gist.github.com/chunhtai/5396b38c5584a8badc3b875db78fe65b

Screenshots or Video

Logs

[Paste your logs here]

Flutter Doctor output