V$LOCK TYPE CR in 12.2

I am trying to run "drop user x cascade" and the drop appears blocked by lock type of "CR" which does not appear in the manual.  Version is 12.2.0.1.0.

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Enter value for session: 276

                                                     Time Held
   SID TY        ID1        ID2 Mode Held Mode Req      Waited BLOCKING
------ -- ---------- ---------- --------- --------- ---------- --------
   276 AE        133          0 Share     None               0 Distr
   276 TS         20   85512563 Exclusive None               0 Distr
   276 TO     202892          1 Row Exc   None               0 Distr
   276 TO     202888          1 Row Exc   None               0 Distr
   276 UL 1073743007          0 Exclusive None               0 Distr
   276 TT         20         16 Share     None               0 Distr
   276 UL 1073743006          0 Exclusive None               0 Distr
   276 UL 1073743005          0 Exclusive None               0 Distr
   276 TO     202890          1 Row Exc   None               0 Distr
   276 CR      65657          1 Shr Row X Exclusive          0 Distr
   276 TS         20   85512562 Exclusive None               0 Distr