Have tried different Backpack mods and they've worked fine.
The issue arises once you place a Jar on top of a Hopper. It's supposed to be a mechanic, but with this mod installed, the game just crashes.

Creator of the other mod updated LBA. Works fine now.

Getting a weird warning after reinstalling it though...

[LibBlockAttributes] The class-based compatibility wrapper for InventoryProvider (alexiil.mc.lib.attributes.item.ItemAttributes$$Lambda$4489/821320367@720937d5) will override every other wrapper for attribute alexiil.mc.lib.attributes.item.FixedItemInvView as UniversalComponents makes every Block implement InventoryProvider!
[04:26:13] [Server thread/WARN]: [LibBlockAttributes] The class-based compatibility wrapper for InventoryProvider (alexiil.mc.lib.attributes.item.ItemAttributes$$Lambda$4489/821320367@1fadd9cc) will override every other wrapper for attribute alexiil.mc.lib.attributes.item.FixedItemInv as UniversalComponents makes every Block implement InventoryProvider!
[04:26:13] [Server thread/WARN]: [LibBlockAttributes] The class-based compatibility wrapper for InventoryProvider (alexiil.mc.lib.attributes.item.ItemAttributes$$Lambda$4489/821320367@b4cf425) will override every other wrapper for attribute alexiil.mc.lib.attributes.item.GroupedItemInvView as UniversalComponents makes every Block implement InventoryProvider!
[04:26:13] [Server thread/WARN]: [LibBlockAttributes] The class-based compatibility wrapper for InventoryProvider (alexiil.mc.lib.attributes.item.ItemAttributes$$Lambda$4489/821320367@4934606d) will override every other wrapper for attribute alexiil.mc.lib.attributes.item.GroupedItemInv as UniversalComponents makes every Block implement InventoryProvider!
[04:26:13] [Server thread/WARN]: [LibBlockAttributes] The class-based compatibility wrapper for InventoryProvider (alexiil.mc.lib.attributes.item.ItemAttributes$$Lambda$4489/821320367@6b74a46) will override every other wrapper for attribute alexiil.mc.lib.attributes.item.ItemInsertable as UniversalComponents makes every Block implement InventoryProvider!
[04:26:13] [Server thread/WARN]: [LibBlockAttributes] The class-based compatibility wrapper for InventoryProvider (alexiil.mc.lib.attributes.item.ItemAttributes$$Lambda$4489/821320367@679e1e28) will override every other wrapper for attribute alexiil.mc.lib.attributes.item.ItemExtractable as UniversalComponents makes every Block implement InventoryProvider!

Just seems like LBA doesn't like Universal Components. The original log didn't mention Inmis, so I assume it's just the dependency conflict. Not much I can do about the issue, outside updating one of my dependencies if patches are released (which I am happy to do if needed).