There's another bug I'm facing. When I tried adding a mod in the list variable, it downloads and deleted afterwards.
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Updating "@tfar" (620019431) | 1
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Redirecting stderr to '/home/quackorduck/Steam/logs/stderr.txt'
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[ 0%] Checking for available updates...
[----] Verifying installation...
Steam Console Client (c) Valve Corporation
-- type 'quit' to exit --
Loading Steam API...OK.
Logging in user 'quackortheduck' to Steam Public...Logged in OK
Waiting for user info...OK
Downloading item 620019431 ...
Success. Downloaded item 620019431 to "/home/quackorduck/steamcmd/arma3/steamapps/workshop/content/107410/620019431" (166388040 bytes)
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Updating "@tfar" (620019431) | 2
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...
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Updating "@tfar" (620019431) | 10
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...
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!! Updating @tfar failed after 10 tries !!
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If I tried downloading manually by using steamcmd, the mod was saved inside the workshop folder and it managed to create a symlink for the mod. Do you know what's happening?