Column width no longer work on tablet & mobile (3.0.5)

Have the same issue, also with the latest 3.0.5, mobile sizing does not work at all.

Using the latest version 3.0.5 I cannot reproduce the issue.
Check if you experience the issue even when you have the safe mode active to rule out a conflict:
https://docs.elementor.com/article/480-what-is-safe-mode

ok, i tried it with safe mode on, nothing changed.

Here’s a screenshot of an 80% wide row taking up 100% and the one above it takes up about 40% but is set to 20%, these settings should make them sit next to each other, but they don’t.

https://photos.app.goo.gl/52ADtvQeZ3cyZiPi7

This is in tablet mode/view

On a different site i work on all rows that had motion animations became invisible, the animation was set to Default, which is funny because that doesn’t exist, it’s either None or one of the animations.
I had to redo all those rows, thankfully i could just move all the widget into the new row.

Would using the Regenerate CSS files option help ?

So this rules out a conflict, but certain Elementor addon plugins like Elementskit can cause issues in other ways, like with it active Elementor’s side panel does not load because it runs out of memory or execution time, which is why upping those in the cpanel fixes it.
This doesn’t feel like a lack of memory issue though.