jm À{Xðæ*â äxh_¦ã"WtfOSbLNot sure. For block 546012 the one in the memo DB was incorrect which caused subsequent blocks to fail. We don't currently have orphan support.
https://whatsonchain.com/tx/39fb20cdd85359d477301109f6cdf14907fb24d435ebd83140f9aecfbb202a4c