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Question: label="dontexpand" where does it come from?

Question:label="dontexpand" where does it come from?

nm 11028 Maple 2023
solve sum rootof
June 10 2023
1

Where do you think label="dontexpand" is coming from in the following? I never seen this before. Is this a bug?

When using PDEtools:-Solve no such error shows up. Worksheet below

998948

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interface(version);

`Standard Worksheet Interface, Maple 2023.0, Windows 10, March 6 2023 Build ID 1689885`

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Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1462 and is the same as the version installed in this computer, created 2023, June 10, 2:26 hours Pacific Time.`

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restart;

998948

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sol:=sum((-2*_R^2+1)/(6*_R^2+4*_R-1)*ln(y(x)/x-_R),_R = RootOf(2*_Z^3+2*_Z^2-_Z+1))-ln(x)-c[1] = 0;
solve(sol,y(x))

sum((-2*_R^2+1)*ln(y(x)/x-_R)/(6*_R^2+4*_R-1), _R = RootOf(2*_Z^3+2*_Z^2-_Z+1))-ln(x)-c[1] = 0

Error, (in solve) cannot solve expressions with sum((-2*_R^2+1)/(6*_R^2+4*_R-1)*ln(y(x)/x-_R),_R = RootOf(2*_Z^3+2*_Z^2-_Z+1,label = "dontexpand")) for y(x)

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PDEtools:-Solve(sol,y(x))

y(x) = exp(-c[1])+_R*x

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