I agree totally. Look the only factor in this is that it can leak water into an already underground rated cable. Keep it simple and use this EPOXY. I have used this before and it is like hand-forming a ROCK. Two weeks ago I used it to attach a steel handle insert (sees very high temps) to a wood handle cover. Works like a champ and handles very high heat. All you care is that it locks out the water and re-forms the LB. Listen to instructions offered by FrodoOne, just do it and call 'er good!In spite of the fact that it should be replaced, it can be repaired (at least, temporarily - to make it watertight) by using an appropriate "Epoxy Putty" - largely, on the inside.
(Here is just one example of such a product - Loctite All Purpose 2 oz. Epoxy Putty-1999131 - The Home Depot )
This product "mixes" like modeling clay.
Clean the "crack" and the inside of the box, . . . remove the "Duct" tape.