After updating, the Roblox app will place itself back into the dock even if it’s been removed in the past. I’m guessing this behaviour may have been intended for first-time setup, but right now it occurs after any Roblox player update.
This doesn’t apply to Studio updates - only the player seems to be affected.
edit: just noticed this also affects Studio
Expected behavior
Either this shouldn’t happen at all or only during first setup.