Homebrew Casks are used to put in pre-compiled functions. Plenty of these include their very own replace mechanism, so having them replace each internally and through brew improve results in points. There’s a part within the Homebrew FAQ masking this.
From that part:
Something put in with Homebrew Cask ought to behave the identical as if it had been put in manually. However since we additionally need to help software program that doesn’t self-upgrade, we add
auto_updates trueto casks for software program that does, which excludes them from brew improve.
The formulae for each Discord and Figma have auto_updates true set.
Because of this any replace will probably be triggered by the appliance itself. These replace mechanisms aren’t conscious of the modified folder location although (this solely impacts Homebrew), in order that they both get confused or set up the replace to the default place.
The best manner out of this most likely is to put in these functions to /Functions (and never onto an exterior disk). If you’re low on disk house, you may as well disable auto-update inside the functions (or cancel any replace try) and run brew replace discord figma commonly (which can power a Homebrew-driven replace even for self-updating functions).
PS: So far as I can see, at the very least Discord does not enable to stop auto-updates. Working brew replace discord earlier than beginning it might the most suitable choice then.