Crashes on fr255/955 since latest firmware 15.19 with writing to copied dc

Hi, I have some responses from users with fr255/955 since latest firmware update (15.19). Also the ERA report give me many errors with invalid value on this devices.

targetDc = dc;
targetDc.drawBitmap(0, 0, backBuffer);

the backbuffer is designed and filled before

        backBuffer = Gfx.createBufferedBitmap({
                :width=> VA_Width,
                :height=>VA_Height
	 	}) as Gfx.BufferedBitmapReference;
        backBuffer = backBuffer.get();
        backDc = backBuffer.getDc();

The code is running also for other SDK4 devices (fenix7) without problem and also for fr255/955 before the latest firmware update.

It seems a copied dc isn't  supported with new firmware. The first write on targetDc runs in invalid value. 

The problem is not reproducable on Simulator. Here the code works perfect since a long time. It is published from Garmin in the Analog sample.

Is this a firmware bug or have we also this issue with the next firmware on other SDK4 devices?