.TPL texture replacement

[danny199012]

Me and a few others are working on Bomberman Wii JP Translation mod a lot of the work is done but whenever we modify a .arc which has .tpl inside after replace the textures necassary and saving the .arc it turns out a lot of Null data is being produced in the saved version which wasn't there tobegin with as a test
I used original sy03.arc and saved it as test.arc I opened it to see if Null data was being added which It saved perfectly fine.

2nd test loaded same .arc and replaced 1 texture file and saved as test2.arc when loading theres many Null files been saved inside
I have attatched 2 screenshots and truly hope this could be fixed I could upload a .arc unmodified if needed for testing but where working in this as it has a exclusive story mode and no other tools i've found are as good or as near as good

if it helps im using Windows11 and my computer is fully up to date
system specifications if needed are
i9 10850k, RTX3090, 32GB Ram, 2x 1TB 980 Pro NVME drives