Line attack spells only damage the enemy at target

[martinrhan]

Describe the bug

I tried using Lightening bolt and Mana beam, both of them are like this.

Steps To Reproduce

Just simply cast a line attck spell.

Expected behavior

Those spells should damage all enemies in the area.

Versions and configuration

• OS: Windows
  • OS Version: 10.0 1903
• Game Version: 0.E-1078-gb459021 [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  Aftershock [aftershock],
  Magiclysm [magiclysm],
  Alternative Map Key [alt_map_key],
  Graphical Overmap [Graphical_Overmap],
  No Rail Stations [No_Rail_Stations],
  DinoMod [DinoMod],
  Mythical Martial Arts [MMA],
  C.R.I.T Expansion Mod [crt_expansion],
  Stats Through Skills [StatsThroughSkills],
  SpeedyDex [speedydex],
  Stats Through Kills [stats_through_kills]
  ]

Additional context

I tried to solve this bug by my self but I cannot as I am not experiance in C++ and also not familiar with the game's code. It is very strange. I guess there should be some problem with in this function.
void spell_effect::line_attack( const spell &sp, Creature &caster, const tripoint &target ) { damage_targets( sp, caster, spell_effect_area( sp, target, spell_effect_line, caster, sp.has_flag( spell_flag::IGNORE_WALLS ) ) ); }
as function damage_targets and spell_effect_area works fine in function cone_attack and target_attack I think its not the problem. But function spell_effect_line has worked nicely in the aiming related code as when I choose target for the spell the affected area are is shown correctly. However it didn't work when executed in damage_targets, because when I cast fireball there are 30+ of sounds produced as each tile in the affected area should have sound produced, but the two line attack spells that I have tested only have one sound produced. That means only one tile was captured as the area of spell effect.