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If I run

expr = (CF G[0, zb])/(1 - zb) + (CF zb^2 G[0, zb])/(1 - zb) + (2 CF G[1, zb])/(1 - zb) + (2 CF zb^2 G[1, zb])/(1 - zb);
Coefficient[expr, zb, -1] 

in Mathematica 12.1, it returns

-((CF G[0, zb])/(-1 + zb)) - (2 CF G[1, zb])/(-1 + zb)

Shouldn't it return 0 since there are no terms in the form 1/zb in expr ?

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    $\begingroup$ Definitely a bug. Also remaining in 12.2. It appears to be fixed in the upcoming release. $\endgroup$ May 12 at 2:09

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