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Question: why dsolve missed this singular solution?

Question:why dsolve missed this singular solution?

nm 8552 Maple 2020
ode singular dsolve differential-equations
January 08 2021
2

Should dsolve has missed this solution? I used singsol=all option:

restart;
ode:=y(x)^2+(x^2+x*y(x))*diff(y(x),x) = 0;
dsolve(ode,y(x),singsol=all)

But y(x)=0 is singular solution. It can not be obtained from the above general solutions for any constant of integration value.

odetest(y(x)=0,ode)

                 0

if I change the type of ode, Maple now gives y(x)=0 but the general solution is too complicated (which is OK) but the point is that it does now find y(x)=0.

dsolve(ode,y(x),[dAlembert]);


           y(x)=0,  etc.....

my question is: Why singsol=all did not also give y(x)=0 in this example?  Is there something I am misundertanding here?

Maple 2020.2
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