Point Light shadows - when set with the Dual Parabloid shadow mode - have a known limitation/artifact in which the seam equator of the two hemispheres meet imperfectly, and a gap exists. This is due to the nature of trying to take 2 flat renders and use a warping algorithm to have it cover 180 degrees, naturally it's imperfect and prone to limitations/precision issues at the edges. A tradeoff from managing point light shadows with only 2 renders - it's a LOT faster, but obviously the limitations/artifact outlier cases can be unpleasant.
Nominally, you'd either rotate the light so the seam isn't noticed, or use the cubemap shadows, which while slower, don't have the seam issue.
Having said that, it could also be other odd precision issues or a different bug, so it's still worth testing on to try and confirm. So for starters, when you rotate the light, does that seam follow the rotation? Or does it disappear entirely?