Mint was on kernel 5.4.0-89-generic and -90, -91, -92 and lastly -94 had been installed. But as I said it was still using -89, because Tumbleweed’s grub was the controlling grub. So I went to Tumbleweed and entered the terminal command grub2-mkconfig. Now after reboot Mint is using -94.
There is probably an easy grub command the tell grub to use Mint’s config, but I don’t know it, so this was an easy work around.