no space left on device, even though there is space left

This occurs when trying to do various things, such as installing Flatpaks.

Looking for matches…
F: An error was encountered searching remote ‘flathub’ for ‘org.kde.krita’: Unable to load summary from remote flathub: Error renaming temporary file: No space left on device
F: An error was encountered searching remote ‘flathub’ for ‘org.kde.krita’: Unable to load summary from remote flathub: Error renaming temporary file: No space left on device
error: No remote refs found for ‘org.kde.krita’
`

iflxy@bazzite:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p5  185G  178G  6.9G  97% /sysroot
composefs        43M   43M     0 100% /
devtmpfs        4.0M     0  4.0M   0% /dev
tmpfs            16G  160M   16G   1% /dev/shm
efivarfs        128K   19K  105K  16% /sys/firmware/efi/efivars
tmpfs           6.3G  368M  5.9G   6% /run
tmpfs           1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
tmpfs            16G   17M   16G   1% /tmp
/dev/nvme0n1p5  185G  178G  6.9G  97% /var
/dev/nvme0n1p4  2.0G  325M  1.5G  18% /boot
/dev/nvme0n1p5  185G  178G  6.9G  97% /var/home
/dev/nvme0n1p3 1022M   13M 1010M   2% /boot/efi
/dev/nvme0n1p1  1.7T  1.6T   68G  96% /var/mnt
/dev/sda1       477G  475G  729M 100% /var/home/iflxy/scdrv
tmpfs           1.0M     0  1.0M   0% /run/credentials/systemd-resolved.service
tmpfs           3.2G  440K  3.2G   1% /run/user/1000
tmpfs           3.2G   56K  3.2G   1% /run/user/0
/dev/nvme0n1p5  185G  178G  6.9G  97% /run/BtrfsAssistant/28ab1ce0-4326-4eaf-8d11-4fcbe8b6f5ad


It also happened a long time ago on my Arch Linux install, I remember btrfs balance helped. No clue how to do that on Bazzite partition layout tho.
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