It might have been a little clearer to write:
“I don’t know what the problem was;
My workaround was to restore a recent snapshot;
After the update was performed again, it worked as expected.
Perhaps the update failed to complete the first time.”
…or, something like that.
At least anyone reading later can then immediately know that the issue wasn’t with Plasma, and they can safely ignore it without having to ask follow-up questions.
Your last post at least says it a little better:
I have taken the liberty of marking that post as the solution.
Cheers.
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This links to much useful information.