Kerbal Space Program

Reproduction steps:

0/ load attached quicksave. Switch to Map view. Notice the ship is ready for burn towards Mun with 14 km Mun periapsis. Remove the second maneuver (0 m/s), notice the trajectory and periapsis remains unchanged.

1/ load attached quicksave. Switch to Map view. Perform about 400 m/s of the burn. Click on second maneuver in the Map view. Notice the projected trajectory and target periapsis immediately changed.
Expected behavior: selecting or manipulation of further maneuvers mid-burn should not affect projected trajectory of the first burn.

2/ load attached quicksave. Switch to Map view. Perform about 400 m/s of the burn. Quicksave and quickload. Switch to Map view. Notice the projected trajectory and target periapsis have changed.
Expected behavior: quicksave/quickload in the middle of the burn should not affect maneuvers.

3/ load attached quicksave. Switch to Map view. Perform about 400 m/s of the burn. Click on Mun, select it as target. Notice the projected trajectory and target periapsis have changed.
Expected behavior: selecting and deselecting targets mid burn should not affect maneuvers and projected trajectory.