Nestopia UE core automatically not change disk side from B to A

[Augusto7743]

I have played a game (Green Beret) and in begin is displayed message to change disk side to B being automatically changed to side B thus the game start, but after some stages the game need change to side A.
Is displayed message to change to side A, but the emulation core not change the disk side.

[Augusto7743]

Have a problem when changing disk side in Nestopia UE core.
Trying start Dracula II Noroi no Fuuin is displayed error message "Side Error 07".

[Augusto7743]

Tested using Nestopia standalone current version and Dracula II Noroi no Fuuin works.
That Nestopia core problem happen since before 09-2021.
Unhappily my topic is being ignored.
Several FDS games with good dump correct Tosec and Nointro checksum having problems when changing the disk side. That’s a problem in Nestopia core.

[keithbowes]

Unhappily my topic is being ignored.

I'm sorry about that, but I for one know nothing about FDS. Do pushing L and R to manually change sides work or is changing sides completely broken?