Review it before committing to an assignment that depends on additional L time, especially where earlier work categories or role changes are involved.
Do not wait for the current document to expire
Identify relevant deadlines and unresolved history early. Have any applicable options assessed on the actual facts; neither a short trip abroad nor a new job title should be assumed to restart the available stay. Anchor the review to the earliest decision that would be expensive to reverse, not to the expiry printed on the current document.
In most plans that decision arrives well before the expiry: a role accepted, a successor appointed to the position abroad, a house listed for sale. Each of those is difficult to undo, and each is usually taken on the assumption that the time is available. Work back from whichever comes first and place the review ahead of it.
While the review is open, the sensible posture is to keep options alive rather than to suspend everything: carry on collecting records, ask the employer to leave the foreign role formally unfilled if it can, and avoid announcing a start date outside the company. Neither a short trip abroad nor a new job title should be assumed to restart the available stay, so a plan that quietly depends on either needs its assumption written where a reviewer can test it.