Firmware 2021 - Scripts CAS on history view

[compsystems]

Hi, I'm having trouble executing a series of statements or scripts in CAS

Example:
Deduction of quadratic equations, step by step in CAS history view

follow the next steps

A: First manually change to CAS mode, then CAS Settings SIMPLIFICATION TO NONE
[CAS]
[Shift]+[CAS]
simplify flag: None
Exact flag: ✔

B: Then run the following instructions

PHP Code:

purge(a,b,c,x); 
assume(a>0);  
(a*x^2+b*x+c) = 0; 
Ans*4*a;      
expand(Ans);    
Ans+b^2;      
Ans-4*a*c;    
simplify(Ans); 
factor(Ans);   
√(Ans);       
expr(replace(string(Ans),"abs","")); 
Ans-b;          
simplify(Ans);
Ans/(2*a);    
simplify(Ans);  
expr(replace(string(Ans),"-b+","-b-")); 


This is the expected result

PHP Code:

purge(a,b,c,x); [enter] "No such variable a",...
assume(a>0); [enter] a
(a*x^2+b*x+c) = 0; [enter] (a*x^2+b*x+c) = 0
Ans*4*a;       [enter] ((a*x^2 +b*x +c) * 4*a) = 0
expand(Ans);   [enter] (4*a^2*x^2 +4*a*b*x +4*a*c) = 0
Ans+b^2;       [enter] (4*a^2*x^2 +4*a*b*x +4*a*c +b^2 ) = (b^2)
Ans-4*a*c;     [enter] (4*a^2*x^2 +4*a*b*x +4*a*c +b^2 -4*a*c) = (b^2 -4*a*c)
simplify(Ans); [enter] (4*a^2*x^2 +4*a*b*x +b^2) = (-4*a*c +b^2)  
factor(Ans);   [enter] (2*a*x +b)^2) = (-4*a*c +b^2)
√(Ans);        [enter] (abs(2*a*x +b)) = (√(-4*a*c +b^2))
expr(replace(string(Ans),"abs","")); [enter] (2*a*x +b) = (√(-4*a*c +b^2))
Ans-b;          [enter] (2*a*x +b -b) = (√(-4*a*c +b^2)-b)
simplify(Ans);  [enter] (2*a*x) = (√(-4*a*c +b^2)-2*b)
Ans/(2*a);      [enter] (2*a*x/(2*a)) = (-b+√(-4*a*c+b^2))/(2*a)
simplify(Ans);  [enter] x = (-b+√(-4*a*c+b^2))/(2*a)
expr(replace(string(Ans),"-b+","-b-")); [enter] x = (-b-√[b^2-4*a*c])/(2*a) 


but now sometimes expressions or numbers are floated ((4. *a^2*x^2 +4. *a*b*x +4. *a*c) = 0) and the symbolic calculation is lost, please tell me if the same thing happens to you too.