Can't deploy my managed solution anymore (ordinalvalue xml error)

Hi,

I've got a SANDBOX and a PRODUCTION environment. There environments are identical. In the SANDBOX environment beholds a unmanaged main solution, in the PRODUCTION environment beholds the managed version of it.

When I tru to import the managed solution I get this error (since 6-7-2018). Before that everything went perfect with deploying this solution.

Unmanaged solution SANDBOX environment (version 1612 (8.2.2.2012) (DB 8.2.2.2012) online)

Managed solution PRODUCTION environment (version 1612 (8.2.2.2012) (DB 8.2.2.2012) online)

Import error managed solution in PRODUCTION

Error:

The 'ordinalvalue' attribute is not declared.

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Anybody known with this error? (Already created a ticket at Microsoft)

Thank you all in advance!

Br,

Jacques