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nothing to do with sagecell, it can be reproduced in Sage:

gap.eval('LoadPackage("qpa");Q:=Quiver(3,[[1,2,"a"],[2,3,"b"]]);KQ:=PathAlgebra(GF(3),Q);AssignGeneratorVariables(KQ);rel:=[a*b];A:=KQ/rel;')

(enter the above as one line). So that's a bug in Sage's GAP pexpect interface. More specifically, it's in a feature that switches to using temp files for interaction as soon as lines are "too long"

sage: gap._eval_using_file_cutoff
100
sage: gap._eval_using_file_cutoff=2000
sage: gap._eval_using_file_cutoff
2000
sage: gap.eval('LoadPackage("qpa");;Q:=Quiver(3,[[1,2,"a"], 
         [2,3,"b"]]);;KQ:=PathAlgebra(GF(3),Q);;AssignGeneratorVariables(KQ);;rel:=[a*b];;A:=KQ/rel;')
 '<GF(3)[<quiver with 3 vertices and 2 arrows>]/\n<two-sided ideal in <GF(3)[<quiver with 3 vertices and 2 arrows>]>, \n  (1 generators)>>'

```