Describe the bug
null error when placing electroblobswizardry "Spectral Dust" into the receptacle on an imbuement altar only while any stairs block is placed next to it. (there may be other blocks that cause this)

• under same conditions, causes spectral dust to duplicate when interacting with receptacles
• under same conditions, game will crash when imbuement of a "Ruined Spell Book" finishes

To Reproduce
1 - have Fluidlogged-API-v2.2.7 and ElectroblobsWizardry-4.3.12 installed
2 - place an EBW "Imbuement Altar"
3 - crouch-place 4 EBW "Receptacle" on each side of the altar
4 - place any "Stairs" block next to one of the receptacles
5 - right-clicking that receptacle while holding "Spectral Dust" will send these errors:

• java.util.concurrent.ExecutionException: net.minecraft.util.ReportedException: Exception while updating neighbours
• Caused by: java.lang.NullPointerException at git.jbredwards.fluidlogged_api.mod.asm.plugins.vanilla.block.PluginBlockStairs$Hooks.notifyNeighboringFluids(PluginBlockStairs.java:50) ~[PluginBlockStairs$Hooks.class:?]

(full error below)
6 - placing 4 "Spectral Dust" into the receptacles and placing a "Ruined Spell Book" into the altar will begin the imbuement process and cause a crash
(full crash log below)

Expected behavior
spectral dust should not duplicate when interacting with an altar next to stairs
game should not crash when imbuement altar finishes imbuing

Screenshots

[imbuement altar during imbuement process, positioned next to stairs]
(screenshot taken from a larger modded instance, but also tested with just these two mods)

Logs
full error - https://gist.github.com/Sethgno/d8135c0d0498b1122497ed162e6dc4bc
full crash log - https://gist.github.com/Sethgno/9e5783832705e1ae984073087248d9ad

this issue is not caused by fluidlogged api