Often, drinking a “Bottomless Potion” fails to give the potion’s special buff.
This is trivial to reproduce by mashing keys while drinking the potion and being near full health, as shown in the video linked below. I am not sure which of the two is required.
Many people are experiencing this bug daily, probably the whole playerbase.
“Bottomless Potion of Amplification” example: https://clips.twitch.tv/ShinyZanyWaspPeteZarollTie-s0-axUrIFKpPk77M
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“Bottomless Potion of Kull-Aid” example: https://imgur.com/a/OajZ3Hd
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Keep in mind this is not just a visual bug, as in the buff really isn’t applied and not only isn’t shown, despite proof missing from these clips.