Thank you for your additional information,
It appears that the employer could notify you either in writing or verbally that your promotion to a new position was confirmed or withdrawn.
Regarding the probationary period, regardless of what your employer might have verbally told you, the letter which gives you information on what to expect, states that the probationary period can be up to 12 months. Therefore, the fact that nothing was said as of the 6-month mark, does not affect the employer because the letter states that they had 12 months within which to decide. This is often done where 6 months is not enough time to assess or evaluate the employee in the new position and rather than make a mistake, they prefer to observe the employee for a longer period of time.
The letter also states that if an employee's promotion is not confirmed, then they shall be reappointed and the letter also states that the employer has the right to withdraw the adjustment and benefits that went with the promotion.
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