Question: Does IntegrationTools:-Combine handle +/-infinity ?

Here is an example where IntegrationTools:-Combine does not seem capable to combine two integrals whose lower bounds are -infinity (same situation holds where upper bounds equal to +infinity).

Is there a way to Combine(J1) without using the J3 workaround?
Is there any mathematical reason why Combine(J1) does not work or it is due to the way Maple handles infinity?

Thanks in advance.

IntegrationTools_Combine.mw

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