Important note ! I´m a Linux player, playing Tower Unite via Steam Proton. While this has low chance to happen due to the Platinum rank of compatibility with Tower Unite, this could be cause by Proton or even MangoHUD which is used to display this framerate artifact.
Volunteers testing on other platforms is welcomed.
You can notice, by the help of the framerates graph in the top left, that it produce some weird spikes when playing Bowling, which automatically stops when exiting the minigame and revert back to normal.