For some reason game does not count my 4 shards as collected.

By using
DebugMode 1
GetVarModInt Q6_PC_SHARDS_COUNT

result is 0
but i have 4
Result is Sabal not Spawning in Throne room.

Fix:

DebugMode 1
SetVarModInt Q6_PC_SHARDS_COUNT 4

After that enter Throne room and Sabal will be there so u can procede with quest.
beware that if u actually did story and not trying to bypass, Sabal Should have 1 shard.
If u are trying to skip then u need to add this as well:
SetVarModInt Q6_SABAL_SHARDS_NUM 1