Incompalibility w/Server Side Waystones!

[Theslees]

When installed alongside Server Side Waystones (https://modrinth.com/mod/sswaystones), many blocks (such as the itemdisplay, or mailbox) issues are introduced.

When placed, the item does not leave your inventory, yet it is placed.

And while//when it is placed, it's invisible until the chunk is reloaded in some way (by rejoining or any means necessary.)

And the mailbox specifically has an issue where the contents of it aren't synced across players depending on who placed things in it, and i assume this is the mailbox's special function, along it being a container

I assume the mailbox disallows anyone but the box's owner to remove content from it, only add, and disallowing the box's owner to add only remove

If that kind of logic is implemented in the mailbox then its not working properly due to the sswaystones mod.

error snippet;

[12:13:28] [Server thread/ERROR]: Failed to handle packet net.minecraft.class_2885@5d69db6, suppressing error
 java.lang.NullPointerException: Cannot invoke "eu.pb4.polymer.virtualentity.api.attachment.BlockAwareAttachment.holder()" because the return value of "eu.pb4.polymer.virtualentity.api.attachment.BlockAwareAttachment.get(net.minecraft.class_2818, net.minecraft.class_2338)" is null

    at knot//eu.pb4.polydecorations.block.item.MailboxBlockEntity.onListenerUpdate(MailboxBlockEntity.java:150)

    at knot//net.minecraft.class_2818.handler$blh000$factorytools$callMethod(class_2818.java:2310)

    at knot//net.minecraft.class_2818.method_32919(class_2818.java:716)

    at knot//net.minecraft.class_2818.method_12216(class_2818.java:406)

    at knot//net.minecraft.class_2818.method_12201(class_2818.java:390)

    at knot//net.minecraft.class_1937.method_8321(class_1937.java:565)

    at knot//net.minecraft.class_2818.localvar$din000$sswaystones$fixSetblockUpdating(class_2818.java:9820)

    at knot//net.minecraft.class_2818.method_12010(class_2818.java:295)

    at knot//net.minecraft.class_1937.method_30092(class_1937.java:234)

    at knot//net.minecraft.class_1937.method_8652(class_1937.java:219)

    at knot//net.minecraft.class_1747.method_7708(class_1747.java:146)

    at knot//net.minecraft.class_1747.method_7712(class_1747.java:71)

    at knot//net.minecraft.class_1747.method_7884(class_1747.java:44)

    at knot//eu.pb4.factorytools.api.item.FactoryBlockItem.method_7884(FactoryBlockItem.java:42)

    at knot//net.minecraft.class_1799.mixinextras$bridge$method_7884$204(class_1799.java)

    at knot//net.minecraft.class_1799.wrapOperation$bdj000$fabric-events-interaction-v0$handleUseOnEvent(class_1799.java:2266)

    at knot//net.minecraft.class_1799.method_7981(class_1799.java:389)

    at knot//net.minecraft.class_3225.method_14262(class_3225.java:395)

    at knot//net.minecraft.class_3244.mixinextras$bridge$method_14262$242(class_3244.java)

    at knot//net.minecraft.class_3244.wrapOperation$daj000$polymer-core$captureBlockInteraction(class_3244.java:14477)

    at knot//net.minecraft.class_3244.wrapOperation$daj000$polymer-core$captureBlockInteraction$mixinextras$bridge$235(class_3244.java)

    at knot//net.minecraft.class_3244.method_12046(class_3244.java:1404)

    at knot//net.minecraft.class_2885.method_12547(class_2885.java:42)

    at knot//net.minecraft.class_2885.method_65081(class_2885.java:10)

    at knot//net.minecraft.class_11980$class_11981.method_74450(class_11980.java:55)

    at knot//net.minecraft.class_11980.method_74449(class_11980.java:38)

    at knot//net.minecraft.server.MinecraftServer.method_76677(MinecraftServer.java:1047)

    at knot//net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:771)

    at knot//net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:301)

    at java.base/java.lang.Thread.run(Thread.java:1474)

this seems to be a mixin conflict.