Mute button on send track actually mutes the input and not the output

I realised that the mute button on a send track actually disables the input to the send and not the output .
-Create a track , insert send device ( enable mute source ) and point the send device to send track 1

-On the send track insert a device that shows the input signal ( sadly renoise does not have that )

-Now mute the send track , the input activity meter shows no activity at all which means that the incoming signal is muted

Is there a reason for this imho odd decision ?

perhaps to allow things like reverb tails to not abruptly cut.

Ahh yes , exactly

As a tip, if you want to “mute” the output, you can add a gainer at -INF db as last element of your send track’s chain, and just toggle it on and off