In the god-awful Disney canon novel Star Wars: Aftermath: Life Debt, we learn that the creature in the Sarlacc Pit was badly wounded in the battle between our heroes and Jabba's forces.
The following is an excerpt of an inner monologue by Malakili, Jabba's former Rancor handler:
He thought maybe to tame the glorious monstrosity at the bottom of the Great Pit of Carkoon (and, failing that, to throw himself into its maw), but the mighty Sarlacc was injured. Burning wreckage from the sail barge had rained upon it. Already its body— considerably more massive than the mouth exposed from the sliding sands— had been partially unburied, its stoma-tubes slit open, its digesting innards pillaged by industrious Jawas. They pulled out weapons and armor, droids and tools. And skeletons, of course.
The creature of Carkoon had a pure purpose, to wait and to eat, and now it was left to thrash and wail in the grip of pillagers.
- Star Wars: Aftermath: Life Debt