While loop only called once

[BrainStone]

When running the generate_step2 process the loop is only executed once.

impulse process generate_step2 {
  /scoreboard players set Counter BM_Variables 0
  
  while: /scoreboad players test Counter BM_Variables 0 5
  repeat {
    create_seed()
    create_seed()
    
    /say Run
    
    /scoreboard players add Counter BM_Variables 1
  }
}

process create_seed {
  /execute @e[tag=Generator] ~ ~ ~ /scoreboard players operation @s BM_Variables += @r[type=armor_stand,tag=RNG,c=1] BM_Constants
  /execute @e[tag=Generator] ~ ~ ~ /scoreboard players operation @s BM_Variables *= @r[type=armor_stand,tag=RNG,c=1] BM_Constants
}

[BrainStone]

(Discard my comments)

[Adrodoc]

This is because mode and needsRedstone of an inline call, which are set for the first ChainPart of a while loop, are not taken into account by the MplProcessAstVisitor.
To honor the command block modifiers of the first command in an inlined process, the proper fix is to add an empty command block with the required modifiers.
This bug only affects calls to inline processes, so until it is fixed, the first ChainPart of a loop, impulse process or repeat process should not be a call to an inline process.
As a workaround you can add an empty command:

impulse process generate_step2 {
  /scoreboard players set Counter BM_Variables 0
  
  while: /scoreboad players test Counter BM_Variables 0 5
  repeat {
    /
    create_seed()
    create_seed()
    
    /say Run
    
    /scoreboard players add Counter BM_Variables 1
  }
}

process create_seed {
  /execute @e[tag=Generator] ~ ~ ~ /scoreboard players operation @s BM_Variables += @r[type=armor_stand,tag=RNG,c=1] BM_Constants
  /execute @e[tag=Generator] ~ ~ ~ /scoreboard players operation @s BM_Variables *= @r[type=armor_stand,tag=RNG,c=1] BM_Constants
}