Is the wording: "Indeed, I find the coolness of his tongue in my hand," authentic, especially since it has been deemed weak due to the reason of Irsaal (disconnected chain of narration)?

The addition in the Hadith: "until I felt the coolness of his tongue on my hand/palm" is authentic and has been narrated in multiple accounts, some of which are strong and good (hasan). Although some scholars have weakened Abu Ubaidah's narration from his father due to the قطع (disconnection) in the chain of transmission, others consider his narrations from his father to be authentic and acceptable, due to his knowledge of his father's Hadith and its soundness.