That is a question for the employer before booking, not an assumption. If the employer is requesting the travel, ask in writing whether it covers changed flights, extended accommodation, and legal fees should the return be delayed or a new filing become necessary.
Get the cost question answered in writing first
Ask the employer to address refundable fares, an extended stay abroad and who retains counsel if return questions arise. Record which expenses are covered and the approval procedure. Confirm any government fee for the actual application route from its official schedule; a contingency budget does not establish a right to reimbursement.
The expensive failure is the one nobody priced: a return that does not go as planned turns into rebooked flights, accommodation, lost working days and an urgent legal review, and none of that sits in the original travel budget. Ask the employer in writing, before the trip, who carries each of those costs and whether the travel is being requested by the company or merely permitted — the answer often changes once it has to be written down. Confirm any government charge against the current official schedule rather than a figure quoted from memory.
Hypothetical example: a farm-equipment dealership asks an employee to attend a short meeting abroad, and the written reply shows the company treats the trip as personal.