helm-gtags-dwim failure over tramp

[felixf3]

I installed Global 6.6.7 on Mac OS Catalina and also on a remote system with Linux CentOS Rel. 6.9.
Locally on the Mac, I am running Gnu Emacs 27.1.

Helm-gtags-dwim works correctly locally and also remotely.
However, when I use tramp, then helm-gtags-dwim and also helm-gtags-find-tag-from-here
fail with this message in the minibuffer: "Error: /home/path/to/filename.cc".
In the Messages buffer, I see "helm-M-x: Error: /home/path/to/filename.cc".

But, when I use helm-gtags-find-tag-from-here, then it works correctly and jumps to the symbol definition.
Please help to fix this problem.