Can my sponsor cancel my Visa and repatriated me...

So, it means that visit visas are currently suspended and then you have to wait until the pandemic ends, so that visit visas are granted again once again.

If the contract of employment includes the appointment of the worker under the condition of experience, the period of the experiment shall not exceed three months. The probationary condition or duration may not be proven unless it is included in the employment contract or by written approval of the worker. However, a worker may be appointed under probation for a period of not more than six months in the professions to be determined by a decision of the Minister of Labor and Social Affairs. Either party may terminate the contract of employment during the probationary period if it becomes apparent that it is not appropriate to continue the contract after giving notice to the other party for one day. The worker may not be appointed under the condition of experience more than once with one employer.