pos.findClosestByPath(flags) returns not a flag

[xoposhiy]

Just received notification from this code:

    var flags:<Flag[]> = ...;
    var flag = <Flag>creep.pos.findClosestByPath(flags);
    if (flag && !(flag instanceof Flag))
            Game.notify("among flags " + flags + " the closest is " + flag, 1);
    }

notification:

among flags [flag mine-1] the closest is [source #55db326cefa8e3fe66e051a0]

Here flag mine-1 is positioned on the source #55db326cefa8e3fe66e051a0.

Usually this code works well and does not send me notifications. But sometimes sends.

[xoposhiy]

Still observe this error:
findClosestByPath somethimes returns object with wrong type.

findClosestByPath(FIND_EXIT_RIGHT) may return extension or flag for example.

[xoposhiy]

reproduce in console:

Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
[9:03:09] [room W12S23 pos 49,42]
Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
[9:03:10] [structure (extension) #5612f7dcb3c550e1219a1da9]


[xoposhiy]

And doublet queries behave that way:

Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
[room W12S23 pos 49,42]
[room W12S23 pos 49,42]
Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
[structure (extension) #5610f4e97232cb0022417b4c]
[structure (extension) #5610f4e97232cb0022417b4c]
Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
Game.rooms['W12S23'].getPositionAt(49, 42).findClosestByPath(3)
[room W12S23 pos 49,42]
[room W12S23 pos 49,42]