I've found that the ripple tool doesn't seem to be working in Premiere Pro Beta v26.0 (build 20); when I grabe a clip end to extend it, the clip stops extending after a couple of frames. Everytime that I try to extend a clip like this, using the ripple tool, it will only extend by a couple of frames. But I can select a clip end, and using the extend tool, extend the clip in the same way that I wanted to use the ripple tool to extend the clip.
This situation with the ripple tool failing to extend a clip occurs whether I've manually selected the rippple tool or I've used the context sensitive timeline option to go into ripple tool mode when I hover the cursor near a clip end.