Beacon buffs not reapplying in strange locations.

[MagnusHellstrom]

• Minecraft Version: 1.12.2
• BetterFps Version: 1.4.8
• Forge/LiteLoader Version (if any): Forge 14.23.5.2847
• Crash Logs (if any): N/A
• Other Mods (if any):
  -Abyssalcraft 1.9.12
  -Abyssalcraft Intergration 1.9.0
  -AE2 Stuff 0.7.0.4
  -Akashic Tome 1.12
  -AppleSkin 1.0.9
  -Applied Energistics 2 rv6-stable-7
  -Astral Sorcery 1.10.20
  -AutoRegLib 1.3
  -Baubles 1.5.2
  -BDLib 1.14.3.12
  -BetterFPS 1.4.8
  -Bibliocraft 2.4.5
  -Binnie Mods 2.5.1.188
  -Botania r1.10-362
  -Brandon's Core 2.4.17.208
  -Chisel 0.2.1.35
  -Clumps 3.1.2
  -CodeChickenLib 3.2.3.358 Universal
  -CoFH Core 4.6.3.27
  -CoFH World 1.3.1.8
  -CTM 0.3.3.22
  -Draconic Evolution 2.3.24.349
  -EnderCore 0.5.69
  -EnderIO 5.1.51
  -Ender Storage 2.4.6.137
  -ExtraUtils 1.9.9
  -Fast Leaf Decay v14
  -FoamFix 0.10.5
  -Forestry 5.8.2.394
  -Shadowfact's Forgelin 1.8.4
  -Fullscreen Windowed 1.6.0
  -Gravestone 1.10.3
  -Guide-API 2.1.8-63
  -Hwyla 1.8.2-B41
  -Industrial Foregoing 1.12.13-237
  -Infernal Mobs 1.12.2
  -Intergration Foregoing 1.9
  -Inventory Tweaks 1.63
  -Iron Chest 7.0.72.847
  -JEI 4.15.0.289
  -JEI Bees 0.9.0.5
  -Journeymap 5.5.5
  -JustEnoughResources 0.9.2.60
  -Magic Bees 3.1.10
  -Mantle 1.3.3.55
  -MatterOverdrive 0.7.1.0-Universal
  -Morpheus 3.5.106
  -Mouse Tweaks 2.10
  -Nuclearcraft 2.18j
  -OpenBlocks 1.8.1
  -OpenModsLib 0.12.2
  -Patchouli 1.0-20
  -PlusTiC 7.1.6.1
  -Railcraft 12.0.0
  -Redstone Flux 2.1.0.6-Universal
  -Tinkers Construct 2.12.0.157
  -TeslaCoreLib 1.0.15
  -Thaumcraft 6.1.BETA26
  -ThaumicJEI 1.6.0-27
  -ThermalDynamics 2.5.5.21
  -ThermalExpansion 5.5.4.43
  -ThermalFoundation 2.6.3.27
  -Tinker Tool Leveling 1.10
  -Twilight Forest 1.1.12
  -Unidict 1.12.2-2.9.2
  -Walia Harvestability 1.1.12
  -Wawla 2.5.273
  -bspkrsCore-universal-7.6.0.1
  -Treecapitator-Client 1.43.0
  -Waystones 4.0.72
  -Zerocore 0.1.2.8

Serverside Only;
InstantUnify 1.1.2

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One of my players reported beacons not reapplying buffs when stood in certain areas of their base, tested with two seperate beacons in different locations and then tested on a singleplayer world in addition all with the same result.

Issue was rectified by disabling Fast Beacons server-side, posting this here for others with the same issue and for a potential fix in newer versions.