Idea 231.8109.175 installPlugins parameter gives inconsistent results

Dear community,

I am using latest Idea Ultimate 231.8109.175 on Manjaro Linux.
I am trying to install some plugins using idea's command-line parameter installPlugins, which gives me inconsistent results.
Sometimes the installation of a plugin works, sometimes it gives me errors.
For example:

$ intellij-idea-ultimate-edition installPlugins Pythonid
gives me the following output

CompileCommand: exclude com/intellij/openapi/vfs/impl/FilePartNodeRoot.trieDescend bool exclude = true
2023-03-30 21:39:18,936 [    970]   WARN - #c.i.o.v.n.p.l.VfsLog - VFS Log version differs from the implementation version: log null vs implementation -43
2023-03-30 21:39:20,500 [   2534]   WARN - #c.j.p.PluginClassPathRuntimeCustomizer - There was more than one class loaded in Projector Plugin classloader - this is likely a bug!
Unable to install plugin 'Pythonid'

But when I look into Idea's installed plugins, I can find the plugin there. But I am unsure if it is installed properly with those error messages.

In the idea.log I only find:

2023-03-30 21:46:21,686 [ 423720]   INFO - #c.i.i.p.PluginManager - Using cached broken plugins file
2023-03-30 21:46:23,538 [ 425572]   INFO - #c.i.i.p.DynamicPlugins - Plugin Pythonid is not unload-safe because it overrides services
2023-03-30 21:46:23,620 [ 425654]   INFO - STDOUT - Unable to install plugin 'Pythonid'

there is not more to find in the log.

Sometimes when I install a plugin it works without the error message, sometimes it prints out the error message after trying to install it again.

It does not seem to be a problem with my network connection.