I suggest posting this on C3's bug section too for immediate action. Scirra doesn't really prioritize Construct 2 bugs as much as Construct 3 bugs.
Instructions are stated here by Ashley :
You can also just redirect this bug report to your C3 bug report too so that Ashley can read this thread too.
I also agree that this is a bug, but I still think the bounce effect shouldn't be removed. Just have a boolean to enable/disable this feature.
This is very useful in high speed 8-direction movements. You'll get what I mean when you set the "Max Speed" to about 5000+ and "Acceleration" to about 2000+.
Think about this as an additional feature. We don't want other old/in-production games that take advantage of this feature to get broken.
I'm not sure if it's feasible but new conditions like "Is collision-bouncing" and "collision-bounce enabled/disabled" would be nice.
And a "set collision-bounce enabled/disabled" action too.