Bridge height warning is too sensitive

On the shattered isles map, if you make a bridge from the limestone near start 1 to the island south of it (both start and end are at height 20) it will warn you that there is not enough room to fit the battleship, even though the ship will gladly take that route and fit just fine

does the warship get taller as it is upgraded? it might be considering maximum height

upgraded ship seems to clip into a bridge at height 20, but navigation overlay says it is passable

Fully upgraded ship lists it's height at 18 too. So seems to potentially be a UI issue.