is this a bug in Solve?

Question:is this a bug in Solve?

Posted: nm 12243 Product: Maple

2 hours ago

Maple 2026 and 2025

eqs:=[_C2 = _C2, _C1 = _C1];
C:={_C1, _C2};
PDEtools:-Solve(eqs,C);

Error, (in PDEtools:-Solve) not a system with respect to the unknowns {_C1, _C2}

Compare to

eqs:=[_C2 = _C2, _C1 = _C1];
C:={_C1, _C2};
solve(eqs,C);

gives correct answer

{c__1 = c__1, c__2 = c__2}

I wanted to report it, but wanted to check first if this is known limitation or not.

Update: Report as bug to Maplesoft

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