The Bug
Int array tags are called TAG_Int instead of TAG_Int_Array in e.g. error messages.
Step to reproduce
/data modify storage _ _ set value [[I;], 0b]❌ Can't insert TAG_Byte into list of TAG_Int (expected: Can't insert TAG_Byte into list of TAG_Int_Array)
Code Analysis
Code analysis by @unknown can be found in this comment.
return "TAG_Int";is written innet/minecraft/nbt/IntArrayTag/TYPE#getPrettyName()instead ofreturn "TAG_Int_Array";.