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/tmp is by default mounted in tmpfs so files in /tmp are stored in memory and its default size is half of your RAM. If you have 16 GiB RAM, tmp size will be 8 GiB, you can use df -h to see size and available free space for all filesystems including tmpfs.

You can disable tmpfs using sudo systemctl mask tmp.mount

Btw. /tmp is for temporary files and applications should not use it to store large amount of data and should remove everything when closed. I'd consider reporting this as a bug to the application you are using.