I've found the next issue https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/11106982/ which has been resolved for Edge browser. I've tested our application and it works fine. The memory gets free well. But the issue is still reproduced for IE 11.706.17134.0 Could you please clarify if the issue is planned to be fixed for IE11 or not?
I bringing it up since for most users, IE11 is still the default browser, not Edge and our customers are complains about memory usage.