Yeah, this is a known issue that I observed myself in my games. In my case it's caused by using non-default eras like the Great Steppe Era or Era of Magic. Abilities of some units in these eras have temporary effects that are reset next turn. When this reset happens, the unit is rebuilt and some LotI effects like many weapon bonuses are lost. They are reapplied when LotI-recalculation of buffs is called, which happens when you change the unit's equipment, for example.a bug in which units carrying LotI magic items sometimes stopped having the benefits of those items. I found that dropping any one item the ground, and picking it up again would restore the benefits of all the carried items to the unit.
I wonder when it happens in your case, whether it's an era, maybe a mod or something else. I think about just forcing LotI buffs recalculation for all players' units each turn, but I have to check it doesn't impact Wesnoth's performance too much.
Statistics: Posted by dwarftough — Today, 9:30 pm