Hello. Everything inside a dofer can no longer be reached outside of the doofer. This was done on purpose, so this is working as expected.
See also https://forum.renoise.com/t/target-tracks-using-meta-from-inside-doofer/45021 and https://forum.renoise.com/t/allow-send-devices-in-doofers/44970 for discussions why or if doofers should behave differently.