Unlikely it will have damaged the oring but before restarting it might just be worth it to drain the loop and check its condition and ensure everything is tight.
The amount of heat possible is unlikely to have caused enough pressure for the oring to fail/leak. As you’d run into a lot of thermal throttle issues etc before that point.
But obviously the increase in pressure could have caused the leak if it wasn’t quite tight or damaged, not seated correctly etc so best to check.
I'm using the same reservoir, and as bad it may sound, sometimes the acrylic tube isn't tightly connected to the base (where the pump is connected).
I had to put a bit more pressure than I was comfortable with to stop it from leaking.
The temperature alone won't force a leak. And if the simply pressure of the pump working forces a leak, the connections aren't secured enough.
My advice is to drain the system, and make sure the o-ring that sits between the acrylic cylinder and the base is't "chewed/damaged".
Secure firmly. Not Hulk-mode, but a tight fit. In fact, it was the first time that I have to go against all my previous experiences and kind of over tighten it. As I said, nothing extreme, but a bit more than the usual, I must say.
The same procedure where the pump connects to the base.
Ensure the fittings are secure in place. They tend to come slightly off when moving the tubes during fitting.
Once all reconnected, with some paper towel, drain the outside of the reservoir, to ensure no coolant left as it will give false alarms for the following check.
After refilling the system, you can use a new piece of paper towel and run it around the small crease/gap(?) between the base and the acrylic cylinder. Any leak would show fluid there, before a bigger quantity of fluid is leaked. I would also recommend to leave a piece of paper tower under the pump just to check if any coolant has leaked.
The only thing I'm unsure what's the correct way to do, and other people may be able to help is, once the system is refilled, I always leave the filling port, the one at the top open, as starting the pump, the coolant level goes a bit down, them I refill a bit, at about 90% of the reservoir capacity, and once the pump is at the desired speed (mine I can adjust manually), I close the filling port. I'm not sure if you should close it, air tight, with the pump off or on? As when the pump is working the coolant level will be lower, so I assume less pressure on the pump, as I assume if sealed with the pump off, when on, some pressure will be created? Or it's simply the same?