Bitcoin daemon - issue after replacing wallet.dat

[indeed-a-genius]

I'm using Bitcoin core 0.20 on Ubuntu 18.
After replacing wallet.dat with my older one, after starting Bitcoin Core it kept "Loading block" and "Loading index".
These errors started appearing in In /home/[user]/snap/bitcoin-core/common/.bitcoin/wallets/db.log:

temporary open: /var/tmp/BDB05682: Permission denied
unable to create temporary backing file
temporary open: /var/tmp/BDB05729: Permission denied
unable to create temporary backing file

I'm launching bitcoind using a systemd unit I created.
I don't know why there's permission problems. I'm able to access /var/tmp/ with the same user and create files inside. it.

[achow101]

Is this still an issue?