CASSANDRA-14841 I stopped it from writing to those tables so it wouldn't generate any errors. Aleksey pointed out I could write just the old columns.
If a user manually adds the new columns to the old version nodes before upgrade they will be able to query this information across the cluster. This is a better situation then making it completely impossible for people to run repairs or perform tracing in mixed version clusters.
This would avoid breaking repair and tracing in mixed version clusters.
The missing columns can be added by following these instructions
For 3.0.15 and 3.11.1 and older versions:
For 3.0.16 and 3.11.2 and newer:
Remember that the INSERT's and nodetool reloadschema must be done on the same node.