It depends. If no infection it shouldn't. But if you get an infection, further fermentation could happen causing enough co2 production to cause bottle bombs.
I've found the best way to clean bottles with dried crud is a soak in PBW solution followed by scrubbing with a bottle brush mounted in a battery powered drill.
I find that filling 1/3 of the way with water, shaking vigorously with my thumb over the opening, then repeating one to three times, gets probably like 95% of bottles shiny clean inside, ready for sanitizer. Most of the remainder can be fixed by filling with hot water and letting soak for a couple hours prior to the above steps.
THE best and cheapest thing I ever did for cleaning bottles.
Until you've used it three times and the bristles on the tip are now pointed sideways, leaving only the rounded end of the wire braid to clean the bottom of the bottle with.
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