When I try to save content since 13.4.0 (The blocks in the RTE change?) I get the below stacktrace returned on the PostSave endpoint:

One or more errors occurred. (One or more errors occurred. (The JSON value could not be converted to System.Text.Json.Nodes.JsonArray. Path: $.result | LineNumber: 1 | BytePositionInLine: 13.))

Nothing is logged to the log file, the stacktrace doesn't mention any namespaces or class names, so I'm at a loss on how to fix this issue... Any help would be appreciated!