STM32WB55 on 64MHz stack do not work normally whith BLE 4.0 peers

I write own firmware using P-NUCLEO-WB55.Nucleo as test platform.

Testing fw with peers with bluetooth versions above 4.0 (4.2 or 5.0), all works fine, but when I took Nexus 7 2013 as peer with BLE 4.0, disconnection occurred with GATT error 133 (0x85).

After a long research and analysis of working examples from SDK, I understood and checked it by experience, that if the systyck is 64MHz, then in this case such an error is issued. By the way, all examples from SDK operate at frequency 32MHz.

Question: Has this situation been verified by STM engineers? Maybe can not use the frequency 64MHz when using the BLE ?

Thanks.

Hi !

Is anyone present here from STM employees?

Can you answer at least one question?

I ask about PPCP, about not correct work stack on 64MHz, about errors in CubeMX, about AN5289, about DLE (all is for STM32WB55) - No answer was given.

Now I want to ask new question about strange behavior of characteristic with write and notification parameters in same characteristic, but I'm not sure that anyone will answer me.

Why then do we need this forum if STM employees ignore real imperfections?