[Heroes 2 Bugs] Summon Boat Spell Bug

English Gold version 2.1
Map: BattleRo.mx2
Saves: a 0999 summon boat bug 01.GX1 (scenario start) - a 0999 summon boat bug 02.GX1

The "Summon Boat" spell is supposed to summon a neutral empty boat at the start of the scenario or an empty boat built in a friendly shipyard or an empty boat last used by a player's hero.

In this scenario, there are only six neutral empty boats available located at (03, 14), (132, 14), (04, 73), (125 73), (19, 136) and (121, 133).

However, when a hero casts the Summon Boat spell, some of the summoned boats come from nowhere and some of the neutral free boats are not moved.

Load: a 0999 summon boat bug 02.GX1
Luna casts Summon Boat, the boat located at (03, 14) is displaced. Wilfrey embarks on the boat.
Luna casts Summon Boat, this boat comes from nowhere, none of the boats located at (132, 14), (125 73), (19, 136) or (121, 133) are displaced. Celia embarks on the boat.
Luna casts Summon Boat, the boat located at (125, 73) is displaced. Luna embarks on the boat.
Natasha casts Summon Boat, this boat comes from nowhere, none of the boats located at (132, 14), (19, 136) or (121, 133) are displaced. Kastore embarks on the boat.
Natasha casts Summon Boat, this boat comes from nowhere, none of the boats located at (132, 14), (19, 136) or (121, 133) are displaced. Dawn embarks on the boat.
Natasha casts Summon Boat, "Summon Boat failed!!!" but there are still available boats located at (132, 14), (19, 136) and (121, 133).
Troyan casts Summon Boat, "Summon Boat failed!!!" but there are still available boats located at (132, 14), (19, 136) and (121, 133).

Files: Summon Boat spell bug.7z
Files: https://drive.google.com/file/d/1tp6Tj_94Ece2_92dXraZqOqage6IQvlb/view?usp=sharing