For some reason this mod adds new items to forge:cobblestone tag, but these items don't exist in Create anymore – can you please remove the data\forge\tags\items\cobblestone.json?

Here's current file content:
{
"replace": false,
"values": [
"create:granite_cobblestone",
"create:diorite_cobblestone",
"create:andesite_cobblestone",
"create:limestone_cobblestone",
"create:weathered_limestone_cobblestone",
"create:dolomite_cobblestone",
"create:gabbro_cobblestone",
"create:scoria_cobblestone",
"create:dark_scoria_cobblestone"
]
}

Thanks for the report. This is not intended and a leftover from the original mod. I've removed it in both the 1.18 and 1.16 versions and they should be up on CurseForge shortly.

I think these materials still exist in the 1.16 version of Create but the tag change is unintended nonetheless.