Adding a line, blank or not, does not cause that issue on my machine (also running v1.8.6.9), instead it shows a space, E.G.
Say, '[hardpoints' or 'weapons' or '] already [retracted' or 'stowed] ' (and wait until it completes)
(note the space between "stowed]" and "'")
Putting the "Say Something with Text-To-Speech" action between condition blocks doesn't affect this (as it shouldn't, just making sure)
Could you export that command and attach it to your post?