When slowly resizing a gnome-terminal window from either the top edge or the left edge, the window is moved. The top/left edge moves with the cursor, but the bottom/right edge doesn't stay in place.
I assume this is because of how gnome-terminal can only be resized one line/column at a time. I assume resizing the window from the top or left edge works by moving the window up or to the left and expanding the width to make the bottom or right edge stay in place, and something about this logic has changed in a recent gnome-shell update to make it not account for windows which can't be resized pixel by pixel.
Attached is a video which shows the bug in action.
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: gnome-shell 3.38.4-1ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 31 11:17:23 2021
DisplayManager: gdm3
InstallationDate: Installed on 2019-11-21 (495 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
RelatedPackageVersions: mutter-common 3.38.4-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to hirsute on 2021-03-16 (14 days ago)
I just tested this in X11, and it's not an issue there. It seems to only affect GNOME on Wayland.