My MCreator Mods now Crash when using Optifine after updating them in version 2025.2

Hello, 

Seems this is my week for comming accross issues. I am currently writing a mod using MCreator started is in MCreator 2024.4, Migrated to 2025.1 all was working fine. I exported the mod and with my retail version of minecraft (Not builtin Mcreator) I have been testing and all has been working fine no issues. I use a number of other mods and every so often I export the mod as it is updated. Since my export in the latest MCreator 2025.2 I could not get the mod work. If I use a version compiled in the previous 2025.1 vesion no issues. I have manage to narrow it down to Optifine. as soon as that is remove all is ok. I need optifine as it is required by a few of the other mods and also the shader I use.

Could someone tell me if this is indeed a bug or if I have done something wrong. as I mentiooned I have done thourough testing. I am using MineCraft 1.20.1 Forge as this still seems to have the most support for addons i require for my builds. The Mod I am creating is just simple Blocks custom for builds I cant find else where ancient civilization & culture items purely ofr creative mode that use 32x32 or 64x64 textures. The testing i have done is that i also reinstalled MCreator 2024.1 compiled the last version of my mod created in there and tested all ok, the i have reinstalled mcreator 2025.2 compiled exactly the same mod after MCreator as updated it itself made not adjustments or added anything just recomplied it works oki as soon as optifine is added crashes i have done this with only optinfine installed no other mods shader or resourcepacks just my mod and the optifie.

Any halep that be give would be greatly appreciated. ty.