Description of the Bug

When using the garlic injection on the injection chair to become a Vampire Hunter (Vampirism mod) while carrying anything within the extended inventory provided by eating the inventory upgrade (Cyclic mod) causes everything carried in it to cease to exist. Other than that, it works exactly as expected. Don't really need a fix for this as I don't intend on having to turn myself into a Hunter twice in the same instance, I'm not running a server (so, I don't have to worry about anyone else) and in order to avoid this bug, all you have to do is empty your extended inventory beforehand, but I wanted to make sure people were aware of this bug. Granted, it may have been the result of some otherwise unnoticeable conflict between one of the additional mods I installed, but I figured, "better safe than sorry".

Sorry if I messed up here, I've never posted to GitHub before.

Expected Behaviour

1. Craft garlic injection
2. With it in hand right-click on injection chair
3. Gain access to Vampire Hunter skill tree (with no effects of any kind on any inventory whatsoever)

Modpack Version

MC Eternal 1.5 for Minecraft 1.12.2

Screenshots

Inventory Upgrade

Extended Inventory w/ garlic injection before injection

Extended Inventory during/after injection's effects

Log

No response

Extra Info

Also running:

arcanearchives-0.2.0.25-mixins8.jar/arcanearchives-0.2.0.25-mixins8-api.jar

lavawaderbauble-1.2.jar

scalingguis-1.12.2-1.0.3.jar

ThaumicInvintoryScanning_1.12.2-2.0.10.jar

Attained+Droops-1.12.2-3.7.3.jar

EnchantingPlus-1.12.2-5.0.176.jar/EnchantingPlus-1.12.2-5.0.176-sources.jar

connectedglass-1.1.1-mc1.12.jar

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I have also disabled/removed Gliby's Voice Chat Reloaded

This is just an unfortunate sideeffect of how Vampirism handles player transformations, it treats the player as a different player with a separate UUID, which also causes funny interactions with Pets, and some other mods.
As is expected, we cannot fix this, and the developers of Vampirism have abandoned 1.12, so this will unfortunately stay a problem.
Cyclic's Extended Inventory is already reasonably unstable, as it can wipe the contents on unexpected disconnects, so we do not recommend using it.

Also THANK YOU for using the Issue Template properly, i see way too many reports that just do not, and it infuriates me.
Interesting way to utilize a bug report i guess, not exactly what was expected, but hey information and preventing 20 other bug reports is good.