dynmap: [1.7.10] Sign markers don't show on map

Forge 1614 FE 1.4.6.1351 Dynmap 2.4

  - class: org.dynmap.MarkersComponent
    type: markers
    showlabel: false
    enablesigns: true
    # Default marker set for sign markers
    default-sign-set: markers
    # (optional) add spawn point markers to standard marker layer
    showspawn: true
    spawnicon: world
    spawnlabel: "Spawn"
    # (optional) layer for showing offline player's positions (for 'maxofflinetime' minutes after logoff)
    showofflineplayers: false
    offlinelabel: "Offline"
    offlineicon: offlineuser
    offlinehidebydefault: true
    offlineminzoom: 0
    maxofflinetime: 30
    # (optional) layer for showing player's spawn beds
    showspawnbeds: false
    spawnbedlabel: "Spawn Beds"
    spawnbedicon: bed
    spawnbedhidebydefault: true
    spawnbedminzoom: 0
    spawnbedformat: "%name%'s bed"