SQM not working on bridged interface 21.02.0-rc4

yeah that looks more sensible... not sure where you got the 'internet' port name (or 'ethernet1' maybe that is normal on that device)

should look more like

config device
	option name 'br-internet'
	option type 'bridge'
	list ports 'lan1'
	list ports 'ethx.x'
	
config interface 'wan'
	option proto 'none' #you probably want proto here
	option device 'br-internet'

see here for more info