Inconsistent current value is displayed when submitting param change proposal

When submitting a proposal for changing a phase length, the current value shown is inconsistent with the value shown in the dashboard. There is a technical reason for this, but potentially confusing to the user. The last block is technically part of the phase but for the user we show it as a break and don't allow proposals as the next block for confirmation would be then outside of phase.

Submitting a param change proposal:

Governance dashboard: