Linux_android hot_mode_dev_cycle_linux__benchmark runs on a linux-motog4 bot, and runs in presubmit.

However, there is only one of these bots in the try pool.
https://chromium-swarm.appspot.com/task?id=685d3bbc1eacaf10&o=true&w=true
https://chromium-swarm.appspot.com/botlist?f=os%3ALinux&f=pool%3Aluci.flutter.try&f=device_type%3Amsm8952

That means PRs are all bottlenecked on one bot. And if that bot dies all the PRs will be pending until it comes back up.

Either:

1. Add more linux-motog4 bots to the try pool
2. Stop running this test in presubmit