I just installed the RStudio v1.4.1071-2 Preview. The console jumps around. Hitting "latest" does something, but doesn't solve it. Hitting escape a few times will stop it temporarily, but then it will start again after scrolling.
─ Session info ───────────────────────────────────────────────────────────────────────────────────────────────────────
version R version 4.0.2 (2020-06-22)
os macOS Catalina 10.15.7
system x86_64, darwin17.0
ui RStudio
language (EN)
collate en_US.UTF-8
ctype en_US.UTF-8