I just grabbed the most recent download, 1.14(2)
I was able to confirm that other medium endings work just fine still. I was even able to finally see the tentacle potion in action.
So I decided to start again and go for the specific ending combination that was causing the looping and I can confirm that even on 1.14(2) the looping still occurs.
By beating Gummy, Crusher, and winning Jester's Game day one
Night 1 I just make a potion.
Day 2 I beat Gummy again, make the feeding potion so the Leezard stays and I don't get Poko.
Night 2 I beat Crusher a second time.
This results in the three being wimps to me in the Grove, as expected. But they still have the Lizard on their side. When I speak to Jester to initiate the Medium Ending sequence it will begin to fade to white before stopping, and leaving me able to speak to him again to initiate the ending. On loop.
This is the only ending sequence I've had this occur on. Specifically where I've bested the Jerks, but did not rid the Beeg Lizard.