Fileopen and Filesave completely break if the temporary folder is accidentally deleted while Libreoffice is running.  This applies to Libreoffice Writer and Libreoffice Impress.

Libreoffice running on Fedora 39? KDE plasma
Context - for some reason, my /tmp folder got wiped sometime, when libreoffice was running.  I had 2 spreadsheets and 1 presentation open.

I created a new presentation, and found after creating 5 slides of work that I couldn't save it.  I just got an error dialog saying he file could not be created.  Libreoffice was then incapable of opening or saving any file, in either PPTX or ODP formats.

Looking in /tmp there was no 'lu8299____.tmp' folder, nor could I recreate it because I didn't know what the last few characters should be.  There was a 'PIPE1000___' file/fifo.

My guess is that because the temporary folder didn't exist, when Libreoffice tried to save a backup file or overwrite an existing backup file, the filewrite call failed with an error because the directory didn't exist.

To test for this error, close all libreoffice, reopen libreoffice, then rename the temporary folder 'lu[proc_num][some random chars].tmp'  It then won't save or open any ODP files.  (Rename the temporary folder back, and all should work again.)

This bug occurs rarely, but has disastrous consequences of leaving your user completely unable to save their work when the bug does occur.

To fix, would it work to check if the temporary folder exists whenever saving/opening a file, recreate the temporary folder if it doesn't exist, then continue to save/open the file as normal.  

I have only experience programming desktop applications in python, and embedded programs in C++ so can't actually help with creating any patch for this bug myself.