That makes sense adonys. Thanks for that post mate. It is very annoying indeed to lose your alt to dive on formation when they pop. With practice, you can actually recognise 'good' contacts from ghosts as ghosts have bigger dots and they usually fly too fast for a bomber group. Also, good hint is when you report a massive formation on 3 o'clock and your squadmates see nothing.
What Farber says is also true - despawn script. No issues for me either in the multisquad campaign.
otoh - he's not right with de Havilland FMs, they have been changed quite a few times and it was not possible to fly them like now in the older betas. The RAF overheating characteristics are changing constantly and rather randomly - just for the record.