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Update:
This appears to be linked to the Night Light.
When Night Light is off:
• The brightness stays at whatever I set it to with xrandr. But, the computer still boots at 100% brightness, and missing the brightness controls.
When Night Light is on:
• The brightness resets to 100% every 60 seconds exactly, and for a few seconds after that according to a consistent pattern.
Interestingly, whenever I manually turn the Night Light on or off, the brightness immediately resets to 100%.