Mod Reinstallation

[FastTquick]

I have a question about the FTB launcher that I've been meaning to ask for a while. If I'm playing with Minecraft FTB and a major new update comes along, will the update cause all the mod items and blocks in the world to delete themselves from the game? I remember when I used to use the Technic pack for my modded Minecraft playthroughs, everytime the Technic pack updates with a major change, it would cause all the mod items in my existing world to delete themselves from the world. I don't really know how modding in Minecraft works, but I found this to be extremely frustrating for me. Is there any way one could configure the FTB launcher to reinstall mods back into Minecraft after getting a new update if this thing happens?

 

[SilvasRuin]

It depends on if the IDs are preserved. The Beta Pack might not have the same IDs as the finished packs, but once the new update hits and all the FTB packs are out, they will be using standardized IDs across the packs and presumably across updates, which should prevent any problems of that sort.