Apparently pigpio PWM uses DMA.
https://www.js4iot.com/2021/06/04/DMA_PWM-PIGPIO.html
@dceejay says he expects GPIO nodes to stop working (presumably when RPiOS is updated for the Pi 5) https://discourse.nodered.org/t/raspberry-pi-5-announced-today-available-oct-23/81656/5 so it looks like switching to node-red-node-pi-gpiod is essential.
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