BTW, there is a problem with GUI of the wallet (version v0.16.3.0-2edec369aminki)
Be careful, this issue will make you lose your money
...
So it sends money to an empty address and the DTCs are lost forever.
The issue does not occur sending money from command line, so it is a GUI related problem.
Indeed there
was a problem, as advised on 2021-06-16 in
this post ...
...
Don't use the 0.16.3 client, revert to either the 0.8.6 client or the Crossverse 0.15.99 client.
I've withdrawn the 0.16.3 release and deleted the repository as it's clear that supporting this particular upgrade is beyond my skillset.
Cheers
Graham