A babka can have a beautifully risen dough and still lose its swirl when the filling slides out during shaping. Before changing the recipe, look at what happened when the chocolate mixture met the dough. Was it spreadable, runny, or so firm that the spatula dragged the surface?
The filling needs to travel across the dough without flooding it. In its Brunch Bakes workbook, King Arthur Baking notes that a chocolate filling which has set too firmly can be warmed briefly to restore spreadability, while excessive warmth makes it too thin. The useful target is a working consistency, not a universal waiting time.
Make a small spreading test
Use the back of a spoon or a small offset spatula on a spare patch of the rolled dough. A suitable filling should leave a reasonably even film without pulling up the dough or running into a puddle. If the mixture needs adjustment, pause while the sheet is still flat. Repairing consistency at this stage is easier than rescuing a slippery roll.
Follow the chosen recipe’s quantities and dimensions. More chocolate is not automatically a better swirl: a thick ridge in the middle produces a different roll from a thin layer spread across the intended area. King Arthur’s chocolate sourdough babka illustrates an even layer and a bare border for closing the roll. Its dough and timings belong to that particular formula.
Try dividing the filling visually into several small patches before joining them with the spatula. That makes it easier to notice an overloaded corner. Keep the recipe’s sealing edge clean, and avoid repeatedly stretching the dough to correct a patch that simply needs a little more filling.
Let the finished slice teach you
After baking and cooling as directed, inspect a central slice. Note whether filling collected at the base, whether some layers are bare, and whether a thick seam remained underbaked. These observations are more informative than judging only the top twist.
For the next bake, change one thing: filling consistency, distribution, or shaping tension. Record what you changed beside the recipe. A clear swirl is the result of several manageable decisions, and the first one happens before the dough is rolled up.