Did your last employer let you know about any areas you needed to improve on during your probation?
Did you let your employer know if you needed any additional support or weren't sure about any aspects of the training?
Probation is two-way so unless you tell your employer you need additional support, training or a reminder and you fail to meet the standards, they might be thinking they've telt you everything but you're just not up to it.
By the same token, if you're doing what you think is a good or at least adequate job and you're not telt otherwise so you can make adjustments, that is the employer's fault.