How do mortar crews get rid of excess propellant?

Original Describing how mortars work:
https://www.youtube.com/shorts/ocV_m8kip5Q

My long video on how artillery works:
https://www.youtube.com/watch?v=Kux_4KGuj1w

Mortar crews get rid of propellent by burning the propelling in controlled burns.

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References:

Original Video
https://www.youtube.com/shorts/ocV_m8kip5Q

https://www.gd-ots.com/munitions/mortars-and-mortar-components/mortar-increments/

https://www.youtube.com/watch?v=CRTLQwvT7ko

https://www.youtube.com/shorts/tSRkmEC1ljY

https://www.youtube.com/watch?v=mMyOdJbDukQ