I believe this depends on the exact message.
Installed 1.2.4.0, and it reflows the same way as the latest dev build, and then if I pinch to zoom or double tap, it doesn't reflow at the edges, but rather changes the overall zoom factor.
I do remember seeing messages reflow when pinching in mobile view.
This 1.2.4.0, released in April, not latest dev build.
Please advise.
If you can go back to a message that was working properly with the previous build, and can retest that exact message again, that would be great.