On a 19c Active dataguard DB I started to see the following internal error in the alertlog:
ORA-00600: internal error code, arguments: [ktuUnReasonableScn], , , [ktbgcl1], , , , , , , , 
Searching MOS shows Bug 21147908 which is associated with Indexes creates on a Global Temporary Table GTT, in some cases the bug fix patch doesn't fix the bug completely! And they suggest dropping the indexes associated with the GTT.
When checking the DB, I figured that the TEMPORARY tablespace on the ADG DB is almost full, I resolved that issue by just adding more tempfiles to the TEMPORARY tablespace on the ADG DB.
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