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The problem comes from the fact that Sage is not able to understand Maxima's answer

f(_SAGE_VAR_t) = ilt((%i laplace(f(_SAGE_VAR_t), _SAGE_VAR_t, g2579 + %i)
 - %i laplace(f(_SAGE_VAR_t), _SAGE_VAR_t, g2579 - %i) + 2 f(0))/(2 g2579), g2579, _SAGE_VAR_t)

I opened the ticket #23445 to track the issue.