I customized a floor terrain that colonies walk faster on this than usual floor(120% walk speed), and bug happens when pawns standing on this floor or trying to pass through. Here are the log information.

Abby pathing from (171, 0, 189) to (188, 0, 181) ran out of cells to process.
Job:Goto A=(188, 0, 181)
Faction: HOTJOJO

This will be the last message to avoid spam.
Verse.Log:Warning(String)
BetterPathfinding.NewPathFinder:FindPathInner(IntVec3, LocalTargetInfo, TraverseParms, PathEndMode, HeuristicMode)
BetterPathfinding.NewPathFinder:FindPath(IntVec3, LocalTargetInfo, TraverseParms, PathEndMode)
BetterPathfinding.PathFinderDetour:FindPath(PathFinder, IntVec3, LocalTargetInfo, TraverseParms, PathEndMode)
Verse.AI.PathFinder:FindPath(IntVec3, LocalTargetInfo, Pawn, PathEndMode)
Verse.AI.Pawn_PathFollower:GenerateNewPath()
Verse.AI.Pawn_PathFollower:TrySetNewPath()
Verse.AI.Pawn_PathFollower:TryEnterNextPathCell()
Verse.AI.Pawn_PathFollower:PatherTick()
Verse.Pawn:Tick()
Verse.TickList:Tick()
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:Update()
Verse.Root_Play:Update()