OK… That’s worked for me.
- Delete on IDE (no exclude) both child devices. NO THE MAIN device
- Change the DHT of the main device to Fibaro Double Switch 2 ZW5 and update
- After updating there will be only 2 devices (instead of 3) for me it was ID 29 and ID 29-2. 1st (id 29) with Fibaro Double Switch 2 ZW5 and 2nd (id 29-2) with Fibaro Double Switch 2 - USB
29 controlled S1 , 29-2 controlled S2. - Rename the device handlers. and assign to rooms in official Smartthings App,
Everything works no “checking status” again.