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Question: Error, (in assuming) when calling '`simplify/do`'. Received: 'invalid simplification command'

Question:Error, (in assuming) when calling '`simplify/do`'. Received: 'invalid simplification command'

nm 8552 Maple 2020
simplify assuming
January 17 2021
0

Why this error shows up when adding assuming?

restart;
expr:= ln(c^2*y/sqrt(c^2)+sqrt(c^2*y^2+1));
simplify(expr,size=true,evaluate_known_functions=false);
simplify(expr,size=true,evaluate_known_functions=false) assuming real;  #error

 

Is this to be expected?

Maple 2020.2
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