When executing below query from web interface or Neo4jClient, Neo4j throws 
error: "ThisShouldNotHappenError: Developer: Andres claims that: This 
should be a node or a relationship"

START n=node(104900)   
OPTIONAL MATCH (n)-[r]-()   
WHERE not (type(r) in ['Dossier', 'Diary'])   
OPTIONAL MATCH (n)<-[dossierRel:Dossier]-(dos)   
SET n.IsDeleted  = true  
REMOVE n.IsIndexed   
SET r.IsDeleted  = true  
REMOVE r.IsIndexed   
RETURN id(dos)

If we remove only one statement from this query, DB works as expected:
START n=node(104900)   
OPTIONAL MATCH (n)-[r]-()   
WHERE not (type(r) in ['Dossier', 'Diary'])   
OPTIONAL MATCH (n)<-[dossierRel:Dossier]-(dos)   
SET n.IsDeleted  = true  
REMOVE n.IsIndexed   
SET r.IsDeleted  = true  
RETURN id(dos)


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