The cue ball drops into a pocket on the opening break, and somebody immediately calls the rack over. Before accepting that decision, establish which rules the table is using. In WPA eight-ball, the break has specific provisions; a break scratch is not automatically the same as losing the rack.
The WPA Rules of Play separate the break-shot conditions from the later losing-the-rack rules. Section 4.3 is the relevant place to begin for the opening shot. Informal pub rules, league formats, and blackball rules can differ, so agree on the format before the first break.
Describe all the balls involved
“Scratch on the break” can leave out useful information. Did the eight ball also fall? Did a ball leave the table? Was the break otherwise legal? Those details can affect the options and placement that follow. Do not borrow a remedy from a remembered situation that involved different balls.
For a practice session, put the rulebook beside the score sheet and work through a few hypothetical breaks without playing a whole rack. Record the condition, the player with the next choice, and the restart specified by the applicable rule. This separates learning the procedure from arguing about a point already on the scoreboard.
At an organised match, call the referee or official rather than moving balls while the ruling is unresolved. Once a ball has been casually spotted or the rack has been rebuilt, it becomes harder to reconstruct the original position.
The useful habit is simple: identify the ruleset, identify that this was the break, and identify the complete outcome. That is enough to avoid the common shortcut that every cue-ball scratch involving an eight-ball game must end the rack.