Issue description:

When placing heat sources such as lava buckets (and in my case the lava crystal from bloodmagic) inside the fuelwood heater, the bucket is consumed.

Steps to reproduce:

1. place a fuelwood heater in the world
2. place a lava bucket or other item that should have non-consumables inside
3. cry from seeing the item vanish

Version (make sure you are on the latest version before reporting):

Forge: 14.23.2.2651
Mekanism: 9.4.3.330
Other relevant version: sevtech 3.0.6

DarkPacks/SevTech-Ages#2033

way of time outlined an example of why this may be happening?

I do remember a ticket like this, can't find it right now.
We released a new version yesterday which contains a lot of bugfixes, it might solve this bug too.