Often have to click stop twice for state to change to stopping

[Eddasol]

Describe the bug
Often when clicking stop we often get the log
2025-12-11 09:51:31,206 - INFO: - api - Received request to stop current mission
2025-12-11 09:51:31,207 - INFO: - api - OK - Mission successfully stopped
but the state doesn't change to stopping and the mission keeps running.

If clicking stop once more the state becomes stopping and the mission stops with this log
2025-12-11 09:51:48,477 - INFO: - api - Received request to stop current mission
2025-12-11 09:51:48,572 - INFO: - state_machine - State: States.Stopping
2025-12-11 09:51:48,573 - INFO: - api - OK - Mission successfully stopped

To Reproduce
Steps to reproduce the behavior:

Expected behavior
Should stop after first request

Screenshots

[andchiind]

The response message is probably not being cleared when it should, so an old event is read.

[andchiind]

I'm moving this to the to-be tested column due to the merging of this PR: #1041