Hello,
I'm under Win10 and Spine 3.6.53

It's been several times since I observed some weirds things, when exporting from Spine into PNG.

Here's my spine:

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My source images all have 3 px padding.

And, When I export:

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I was actually expecting Spine would cut the transparent pixels, and trim the image. Because if I go into Photoshop and I trim:

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Then, everything is fine. Check the hand on the right.

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So, why no trim in Spine?

I just realised that Spine might trim but, taking into account the mesh box. Am I right? If so, why not add a parameter when the mesh box are not taken into account.

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