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I understand everything, but there is no error. You can even open the campaign.xdb file with Notepad (after unpacking the mod). The necessary script for the transfer is located there.
Here it is:
Linaas
1
Linaas
3
Shadwyn
4
Ferigl
4
Linaas
4
1 - Misty Forest
3 - Stinking Swamps
4 - Peak of Stars
When playing through the maps, everything is fine for me, but I started from the beginning. At the same time, if you load missions that the hero has already completed, they will be at level one, which is natural. Heroes are only transferred forward.
P.S. I have version 3.0, but I don't think this is a hindrance... so I don't know what to say... I will continue to work on it, maybe I can fix something (provided I find something to fix)