I might have suggested to build the crown out the thickness of the tile and continue the crown around the shower over the tile so you would not get the finish you have.
Crown molding around tile shower.
I regret not placing crown molding around the shower because it has created an open transition at the juncture picture below.
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Cut a strip of wood thinner than your crown moulding and the same width as your sheets of tile.
I suggested placing a rossette at the juncture but dear gc doesn t like it when i think outside the box.
If you were to search for this problem online you would find people have tried every single one of the above for solutions to this same bathroom problem.
Transitioning crown molding between tile and drywall.
Using a piece of crown molding as a reference nail the board to the wall slightly above the bottom edge of the crown.
Start tiling directly under the board mark the location of your studs we did.
Or maybe cut out some of the bottom of the crown molding to fit around the tile.