What is the problem you're trying to solve

In capacity plugin attr.deserved no need MinDimensionResource with attr.request.
In proportion plugin, attr.deserved is computed dynamically using min-max faire share algorithm, so attr.deserved needs MinDimensionResource with attr.request to share the ununsed quota with other queues.
But in capacity plugin, attr.deserved is configured by the user, so the MinDimensionResource is not need any more.

Describe the solution you'd like

Just move this line in OnSessionOpen of capacity plugin.
attr.deserved = helpers.Max(attr.deserved, attr.guarantee)

Additional context

I will do the PR.