Describe the bug
Make sure to include:

1. What did you expect to happen?
   Ore to melt and to leave my world in tact.
2. What actually happened instead (i.e. what was the bug)
   Crash that prevents opening said world.
   https://paste.dimdev.org/idevepukez.mccrash

To Reproduce
Attention to detail is important!
1: Place an ore into a forge and attempt to melt it (I used 5 normal "25U" tetrahedrite ore melting it into 4 ingot molds)
2: Melt at appropriate heat and cause a ticking block entity issue.

Meta Info

• TFC Version: 1.12.2-0.27.7.107

I just attempted to reproduce, and could not. Can you please be more specific with what you did?

I wasn't in the GUI when it happened, I exited it and opened my inventory, (likely irrelevant but I had the game in the background as I was speaking on Discord).

Also can't produce with items listed. Can you reproduce this crash with just TFC?

I attempted to reproduce again, with my inventory open instead, and could not. If you can give some more specifics how you caused this, that would be great!

Just looking at my mods list, the only mods that could potentially interfere with TFC are TFC: Metallum, as it adds new metals and could possibly break forging in some way, alternatively Tinkers' Construct adds molten copper along with other molten metals, TFC seems to always be overwritten by other mods when it comes to fluids so it could also be that.
My attempts to reproduce the crash didn't work unfortunately, even with the same mod list.
I can't provide much more information unfortunately, that's all I can remember and I've been as specific as I could.
I'm fine with discarding the world, I hadn't built up much in it yet but the possibility of this crash returning for someone or myself at some point in the future is what bothers me.

If there's other occurrences or information we can look into them. Otherwise if it's not reproducible...