java.lang.ClassCastException during upsert

Dataset was created using hudi 0.5 and now trying to migrate it to the latest master. The table is written using SqlTransformer. Exception:

Caused by: org.apache.hudi.exception.HoodieUpsertException: Failed to merge old record into new file for key bla.bla from old file gs://../2020/03/15/7b75931f-ff2f-4bf4-8949-5c437112be79-0_0-35-1196_20200316234140.parquet to new file gs://.../2020/03/15/7b75931f-ff2f-4bf4-8949-5c437112be79-0_1-39-1506_20200317190948.parquet
at org.apache.hudi.io.HoodieMergeHandle.write(HoodieMergeHandle.java:246)
at org.apache.hudi.table.HoodieCopyOnWriteTable$UpdateHandler.consumeOneRecord(HoodieCopyOnWriteTable.java:433)
at org.apache.hudi.table.HoodieCopyOnWriteTable$UpdateHandler.consumeOneRecord(HoodieCopyOnWriteTable.java:423)
at org.apache.hudi.common.util.queue.BoundedInMemoryQueueConsumer.consume(BoundedInMemoryQueueConsumer.java:37)
at org.apache.hudi.common.util.queue.BoundedInMemoryExecutor.lambda$null$2(BoundedInMemoryExecutor.java:121)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 more
Caused by: java.lang.ClassCastException: org.apache.avro.util.Utf8 cannot be cast to org.apache.avro.generic.GenericFixed
at org.apache.parquet.avro.AvroWriteSupport.writeValueWithoutConversion(AvroWriteSupport.java:336)
at org.apache.parquet.avro.AvroWriteSupport.writeValue(AvroWriteSupport.java:275)
at org.apache.parquet.avro.AvroWriteSupport.writeRecordFields(AvroWriteSupport.java:191)
at org.apache.parquet.avro.AvroWriteSupport.write(AvroWriteSupport.java:165)
at org.apache.parquet.hadoop.InternalParquetRecordWriter.write(InternalParquetRecordWriter.java:128)
at org.apache.parquet.hadoop.ParquetWriter.write(ParquetWriter.java:299)
at org.apache.hudi.io.storage.HoodieParquetWriter.writeAvro(HoodieParquetWriter.java:103)
at org.apache.hudi.io.HoodieMergeHandle.write(HoodieMergeHandle.java:242)
... 8 more