When Ripple Deleting empty part of the Timeline, a 1 frame space is left.
-Select a space without clips in the Time Line
-Press command-Backspace
-See how a 1 frame space is left
Maybe this is related to my other bug report for 25.0.0.0 / Mac
https://community.adobe.com/t5/premiere-pro-bugs/paste-insert-not-accurate/idi-p/14973621#M40199
I tested in in the previous version of Premiere Pro - the problem does not exist there.