Sometimes this happens and it is my least favorite part of software development, but: sorry folks, this is not our fault. The problem is with AMD's software. You can ignore that and insist it's our fault anyway, or that we do something about it anyway, and nothing will happen, because it's not our fault and it is impossible for us to fix the root cause.
Ordering in a bunch of expensive equipment in what is normally a hopeless effort is not something we're willing to do. Like I say I would fully expect that to cost us money and result in a dead end - because it's not our software that's broken.
So there's apparently a workaround with an old setting. I guess you can keep using those old Construct releases then. It is a total mystery to me how the old setting could possibly have anything to do with this whatsoever: that setting just sets a flag in the browser engine asking it to reduce the latency of display. What that does I don't know, and why it works around the problem I have no idea, but it also caused a whole bunch of other bugs and problems, so if we bring that back we get all those problems back, which I don't want to do either. As ever, the only way to really solve problems is to fix the root cause, which is in AMD's software.
Your choices are: continue to insist we act on it anyway, which will be fruitless, or actually get in touch with AMD (don't ask me how, we're not AMD) or the browser vendors, either of whom may be actually able to do something about it. Those of you who actually want to see the problem fixed, please choose accordingly.
For those of you who think "just make a 3D engine, how hard can it be?" - food for thought.