Train upgrader clears both train group and interrupt when upgrading a train/wagon

[jigsaw3xD]

Title

[jigsaw3xD]

The reset happens not upon upgrading but when the initial call to a train is created (when upgrader station is added to its schedule)

[jigsaw3xD]

looks like new schedule API could fix this exact issue https://forums.factorio.com/viewtopic.php?t=118044