Environment

• TeXstudio 4.8.1 (git 4.8.1)
• Qt version 6.7.1, compilé avec Qt 6.7.1 R
• OS: MacOS Sonoma 14.2.1 (23C71)
• TeX distribution: TeX Live 2023

This issue is largely documented here, it seems that TeXStudio does not automatically adapt its preview tool to the compiler used. This apparently caused a bug which ended up filling up the OP's hard-drive. The issue was not easily reproducible though, so it may be hard to solve.

Expected behavior

Preview command changes with compiler, i.e. compiling with pdflatex imposes a pdflatex preview, lualatex a lualatex preview, etc.

Actual behavior

Preview and compilation commands are independent, which may cause the aforementioned hard drive filling up process.