Secondary drive mounted in home directory trashing to primary drive

I have a mounted a btrfs drive straight into ~/HDD (not exactly best practice but it works for me) and I noticed that despite creating a .Trash-1000 directory in the drive, dolphin will still put trashed files into ~/.local/share/Trash whenever I delete them there. Using trash-cli with the trash-put command fails to produce the same behavior, with trashed files going into the correct folder on either drive. Unsure if this is a bug or just some quirk of how dolphin configures trash vs freedesktop but help would be much appreciated! I am on Arch Linux with everything latest.

/etc/fstab for the secondary disk:

/dev/mapper/luks-(my drive's UUID) /home/cncz/HDD btrfs defaults,compress=zstd 0 0