For Icom rigs like IC910H and IC9700 Main/Sub are only used for split and satmode

Otherwise VFOA/B can be used on either Main or Sub VFOs
So if Main is requested and not in split/satmode then VFOA is assumed -- this case was fixed
And if Sub is requested and not in split/satmode then VFOB is assumed -- this was already true
https://github.com/Hamlib/Hamlib/issues/832

rigs/icom/icom.c

@@ -2702,6 +2702,8 @@ int icom_set_vfo(RIG *rig, vfo_t vfo)
 
     case RIG_VFO_MAIN:
         icvfo = S_MAIN;
+        // If not split or satmode then we must want VFOA
+        if (VFO_HAS_MAIN_SUB_A_B_ONLY && !priv->split_on && !rig->state.cache.satmode) { icvfo = S_VFOA; }
         break;
 
     case RIG_VFO_SUB:

rigs/icom/icom.h

@@ -30,7 +30,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20211015"
+#define BACKEND_VER "20211020"
 
 #define ICOM_IS_SECONDARY_VFO(vfo) ((vfo) & (RIG_VFO_B | RIG_VFO_SUB | RIG_VFO_SUB_B | RIG_VFO_MAIN_B))
 #define ICOM_GET_VFO_NUMBER(vfo) (ICOM_IS_SECONDARY_VFO(vfo) ? 0x01 : 0x00)