conan: Upload error while building multiple configurations

Operating system: Linux Python version: 3.6.2 Conan version: 1.8.2 Conan-package-tools: 0.19.4

When uploading a package built with multiple configurations using conan package tools I get the following error while trying to upload second build. The user has write permissions but not delete permissions.

Uploading conanmanifest.txt                                           
ERROR: 
Error uploading file: conanmanifest.txt, '{
  "errors" : [ {
    "status" : 500,
    "message" : "Not enough permissions to overwrite artifact 'local-conan:user/zlib/1.2.11-14/master/export/conanmanifest.txt' (user 'user' needs DELETE permission)."
  } ]
}'

Same operation works without problems when using version 1.7.4 and same version of conan package tools.

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