This is with Logos 37.0 beta 3 on Mac.
With the Corresponding text in other books option enabled and with Text selection turned on, then selecting text in one Bible shows the same selection in another
Here the light shines in the darkness in John 1:5 in the NIV

but if I click the NA27 tab to make it active, the corresponding highlighting disappears even though the text is still selected in the NIV

If I click on the NIV tab again, then the highlighting reappears.
Has this always been the case or is this a recent change?
I noticed it because I had two Bibles on the same tab and even when I had text selected in one it didn't show in the other when I switched to it.