As the title suggests, there seems to be a bug in Writer wherein I cannot delete a bunch of text by long-pressing the backspace key while track changes is on. This issue only occurs while I am deleting original text (i.e., text entered prior to enabling track changes) with track changes enabled.
Here’s a link to a video demonstration of this issue (sound on): https://www.youtube.com/watch?v=mQnsr2C4xTs
I have Libre 188.8.131.52 on macOS Catalina. I have not investigated this bug on Windows or Linux.