Apple claims they fixed RAM management issues in iOS 13.2.2 and iPadOS 13.2.2. I don’t think that it’s a bug.
Are you multitasking heavily? My iPhone 11 Pro is on iOS 13.2.2 and the Discourse app seems to work fine. It never crashes or refreshes when doing light or medium multitasking.
Then again, my iPhone has 4 gigabytes of RAM. Considering that iOS 13.2.2 (and iPadOS 13.2.2) is supported on devices with at least 2 gigabytes of RAM, it could simply be because of the age of your device.