Excuse me. I thought I mentioned this. I'm already implementing i-frames for the grapple-minigame icon.
Also, just double-checked and it seems the "i-frame timer after ending a grapple" got reset to 1 second instead of 1.6. I don't know when and why. Now reverted to 1.6 secs (or 2 secs. I'll see.)
These changes should be in the next, next update.
Thanks for the catch!