Waterfall during tx not showing Pure Signal action

[EI2HH]

I'm not sure which version this is since, but when engaging Pure Signal I used to see the unwanted sideband emission disappear on the waterfall during tx, showing how well it is working.

Now both sidebands look the same. Pure Signal bar is green on tx.

(2.10.3.4)

Thanks

Andy
EA5JGN