DLLs not correctly copied

We are trying to build the standalone (windows x86_64) app on Azure Pipelines and we get a strange behaviour when Unity is copying the 3rdParty dlls to the Plugins folder. Each of these dlls have only 1KB.
The Plugins ones are correctly copied.
The file system is:
Assets/3rdParty/dll1/dll1.dll => 1KB
Assets/Plugins/dll2/dll2.dll => normal size

It is work mentioning that building from Editor works fine – all dlls are correctly copied.

Do you have any ideas why this happens?

 

I think I found the reason.
Those files are not the real files but the git lfs hooks. Their content is:
version https://git-lfs.github.com/spec/v1
oid sha256:-----
size ----