Intro:

Could not down-cast

What you expected to happen:

Can down-cast after instanceof check.

Script used and crafttweaker log

https://gist.github.com/friendlyhj/367add6a8c7ea49a9c8c596db8483227

Environment:

• Minecraft Version: 1.16.5
• Forge Version: 36.0.42
• CraftTweaker Version: 7.1.0.257
• Are you using a server: no

try only using casts on the left side for an unchecked cast

Oh, I forgot to post error when casting only on the left side.
https://paste.ubuntu.com/p/5Cgc48bQd8/