Oracle issues after upgrade to 12.2

If we look into the source of this view ctx_preference_values:

create or replace view ctxsys.ctx_preference_values as 
select /*+ ORDERED INDEX(dr$preference_value) */ 
u.name prv_owner 
,pre_name prv_preference 
,oat_name prv_attribute 
,decode(oat_datatype, 'B', decode(prv_value, 1, 'YES', 'NO'), 
nvl(oal_label, prv_value)) prv_value 
from 
sys."_BASE_USER" u 
,dr$preference 
,dr$preference_value 
,dr$object_attribute 
,dr$object_attribute_lov 
where prv_value = nvl(oal_value, prv_value) 
and oat_id = oal_oat_id (+) 
and oat_id = prv_oat_id 
and prv_pre_id = pre_id 
and pre_owner# = u.user#; 

and check PRV_VALUE from ctxsys.dr$preference_value:

select pre_name, prv_pre_id,prv_value 
from ctxsys.dr$preference 
, ctxsys.dr$preference_value 
, ctxsys.dr$object_attribute 
where prv_pre_id = pre_id 
and oat_id = prv_oat_id 
and oat_datatype='B' 
and not regexp_like(prv_value,'^\d*$') 
/ 
PRE_NAME                          PRV_PRE_ID PRV_VALUE
--------------------------------- ---------- ----------
CTXSYS.JSONREST_GERMAN_LEXER            1098 YES
CTXSYS.JSONREST_GERMAN_DIN_LEXER        1104 YES

we can find that the root cause of the problem is the line with decode(prv_value, 1, ‘YES’, ‘NO’)
and values ‘YES’ for preferences ‘CTXSYS.JSONREST_GERMAN_LEXER’, ‘CTXSYS.JSONREST_GERMAN_DIN_LEXER’.

Oracle tries to compare ‘YES’ with 1 in decode() and raises ORA-01722.