Question: "Error, (in simplify/size/collect_and_recurse) invalid arguments to coeffs" (Bug of the general Maple simplifier?)

As you can see, if I want to simplify the following expression, I shall have to run the simplify command three times, and if I add some assumptions, the global simplify command will no longer work! 


Download collect_and_recurse)_invalid_arguments_to_coeffs_.mws

But here either Physics[Simplify] or evala@Simplify works (with a slightly different result, though). Does anyone know why?

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