Installed linux-raspi/5.13.0-1011.13 from impish-proposed and verified:
$ modinfo pwm_bcm2835 | head -2 filename: /lib/modules/5.13.0-1011-raspi/kernel/drivers/pwm/pwm-bcm2835.ko license: GPL v2
Installed linux-raspi/ 5.13.0- 1011.13 from impish-proposed and verified:
$ modinfo pwm_bcm2835 | head -2 5.13.0- 1011-raspi/ kernel/ drivers/ pwm/pwm- bcm2835. ko
filename: /lib/modules/
license: GPL v2