Why can Discovery transport the tardigrade at the end of the show when at the start the shielding prevented them?

Question

In Star Trek Discovery S1:E3 Context is for Kings we see the USS Glenn, which contains the mycelial plane experiments and dead crew.

We learn (from Saru) that it is not possible to transport the experiments to the discovery due to lab shielding, so the crew will have to go across to the USS Glenn.

At the end of the episode, the tardigrade has been transported to the USS Discovery.

Indeed, the following commentator writes:

In this ep, Saru says the shielding of the test lab on the Glenn prohibits using the transporter to retrieve the project materials. yet we see the guest on board at the end

My question is: Why can Discovery transport the tardigrade at the end of the show when at the start the shielding prevented them?

Answer 1

The lab is probably shielded for the very same reason why you would shield your warp-core. You don't want an enemy beaming out your core or precious research once your main shields go down.

Therefore they cannot beam out the experiments directly. But the tardigrade creature does not reside in the shielded room anymore and thus can be transported.