phabricator 33ec855449dde85b3053bb22e59b9c55d6b7f810 (Tue, Jun 14)
arcanist c13e5a629535f460ca1a16d0bfe6d95f43b70b78 (Thu, Jun 9)
phutil fb1e159d36402cc5f6cdb64726599acf784283b6 (Mon, Jun 13)

Reproduction steps:

• Install a clean phabricator instance
• Create a "Username/Password" auth provider (with default options)
• Disable provider
• Enable provider
• Click on "Username/Password" to edit the auth provider

Expected result:

• Configuration screen is opened and i can edit the provider

Actual result:

• Exception is shown: "Bad getter call: getProviderName"

I tested it too with "Google OAuth" with the same results.