To reproduce:

• Place a TileEntity from Betweenlands that has an inventory (e.g., a Purifier) near a chest, and place an item in the chest.
• Search for said item.
• Observe that inventory does not close and smoke particles are not emitted and that a NullPointerException has been caught and logged.
• Move away from or remove the Betweenlands block and repeat the search.
• Observe that the item seearch function works as expected.

I can confirm this is reproducible with the Purifier and Sulfur Furnace - probably with every inventory that isn't the Weedwood chest.

Here's the stack trace:

[Server thread/FATAL] [net.minecraft.server.MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_171]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_171]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666) [MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185) [chd.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]

Sounds like the same issue I'm facing (MC 1.12.2, findme 1.1.0-8 in SevTech Ages v3.2.1), the server spits this out if it finds an item:

[20:08:55] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
        at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_311]
        at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_311]
        at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_311]
Caused by: java.lang.NullPointerException
        at micdoodle8.mods.galacticraft.core.tile.TileEntityInventory.func_191420_l(TileEntityInventory.java:46) ~[TileEntityInventory.class:?]
        at com.buuz135.findme.network.PositionRequestMessage$Handler.lambda$onMessage$0(PositionRequestMessage.java:85) ~[PositionRequestMessage$Handler.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_311]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_311]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
        ... 5 more

Thats an Betweenlands issue. When I request if the tiles have the ITEM_HANDLER_CAPABILITY on the null side it returns true but when I get the capability I get a null one.