How can I use emacs-jedi with another virtualenv for my project? - emacs-jedi

Question

I've installed emacs-jedi several months ago and it worked very well. After some time without a python project I came back (with an update to emacs 26 and re-installed emacs-jedi) and I have a problem:
When I just start emacs, jedi works fine. But as soon as I run M-x pyvenv-workon some_python3_venv, jedi stops working. I get the dreaded error (and of course I tried to jedi:install-server) :
Error (jedi):
================================
Failed to start Jedi EPC server.
================================
*** EPC Error ***
Server may raise an error. Use "M-x epc:pop-to-last-server-process-buffer RET" to see full traceback:
No handlers could be found for logger "jediepcserver"
*** EPC Server Output (last 10 lines) ***
No handlers could be found for logger "jediepcserver"
*** EPC Server Config ***
Server arguments: ("/home/me/.emacs.d/.python-environments/default/bin/jediepcserver" "--virtual-env" "/home/me/.virtualenvs/some_project")
Actual command: /home/me/.emacs.d/.python-environments/default/bin/jediepcserver
VIRTUAL_ENV envvar: "/home/me/.virtualenvs/some_project"
*** jedi-mode is disabled in #<buffer algorithms.py> ***
Fix the problem and re-enable it.
*** You may need to run "M-x jedi:install-server". ***
This could solve the problem especially if you haven't run the command yet
since Jedi.el installation or update and if the server complains about
Python module imports.
In the "good after fresh start" case, jedi:show-setup-info tells me this:
;; Emacs Lisp version:
(:emacs-version "26.1" :jedi-version "0.2.7" :python-environment-version "0.0.2alpha0")
;; Python version:
((:version "2.7.16 (default, Apr 6 2019, 01:42:57) \n[GCC 8.3.0]" :name "sys" :file nil)
(:version "0.13.3" :name "jedi" :file "/home/me/.emacs.d/.python-environments/default/local/lib/python2.7/site-packages/jedi/__init__.pyc")
(:version "0.0.5" :name "epc" :file "/home/me/.emacs.d/.python-environments/default/local/lib/python2.7/site-packages/epc/__init__.pyc")
(:version "0.0.3" :name "sexpdata" :file "/home/me/.emacs.d/.python-environments/default/local/lib/python2.7/site-packages/sexpdata.pyc"))
;; Command line:
(:virtualenv "/usr/bin/virtualenv" :virtualenv-version "15.1.0\n")
;; Customization:
((jedi:complete-on-dot)
(jedi:doc-display-buffer . display-buffer)
(jedi:doc-hook view-mode)
(jedi:doc-mode . rst-mode)
(jedi:environment-root)
(jedi:environment-virtualenv)
(jedi:get-in-function-call-delay . 1000)
(jedi:get-in-function-call-timeout . 3000)
(jedi:goto-definition-config
(nil nil nil)
(t nil nil)
(nil definition nil)
(t definition nil)
(nil nil t)
(t nil t)
(nil definition t)
(t definition t))
(jedi:goto-definition-marker-ring-length . 16)
(jedi:imenu-create-index-function . jedi:create-nested-imenu-index)
(jedi:import-python-el-settings . t)
(jedi:install-imenu)
(jedi:install-python-jedi-dev-command "pip" "install" "--upgrade" "git+https://github.com/davidhalter/jedi.git#master#egg=jedi")
(jedi:key-complete .
[C-tab])
(jedi:key-goto-definition .
[67108910])
(jedi:key-goto-definition-pop-marker .
[67108908])
(jedi:key-related-names . "r")
(jedi:key-show-doc . "d")
(jedi:server-args)
(jedi:server-command "/home/me/.emacs.d/.python-environments/default/bin/jediepcserver")
(jedi:setup-keys)
(jedi:tooltip-method)
(jedi:use-shortcuts)
(python-environment-default-root-name . "default")
(python-environment-directory . "~/.emacs.d/.python-environments")
(python-environment-virtualenv "virtualenv" "--system-site-packages" "--quiet"))
After I ran M-x pyvenv-workon, I get almost the same output, but the section ;; Python version: shows some error:
;; Emacs Lisp version:
(:emacs-version "26.1" :jedi-version "0.2.7" :python-environment-version "0.0.2alpha0")
;; Python version:
nil
;; EPC error:
(:get-epc-error
(wrong-type-argument epc:manager nil))
What Do I have to do to run emacs-jedi together with the virtualenv that I need for my project? I tried to customize jedi:server-args, but that didn't help.