Extra transparent pixel when resizing canvas & when exporting from Illustrator

Hello! I am having two main issues with Photoshop.

Photoshop version: Adobe Photoshop Version: 24.2.0 20230218.r.315 28c9f72 x64

PC version: Windows 10 Pro

Issue one is that Photoshop adds a transparent px when resizing the files. This is not visible to the eye and inside photoshop it does not appear as if there is any transparency, but when uploading the file in the coding software the lowest layer becomes visible. Is there a way to solve or overcome this issue? 

The second issue emerges when exporting as a .psd file from illustrator, the .psd file has 1px more in width and height (I added the walkthrough and screenshots below).

Step 1: open a new canvas in AI, place the icon on the canvas, and size it accordingly to the icon (e.g. 27x45)

Step 2: export > export as.. > type: photoshop (use artboards selected) > setting as follows

Step 3: open the .psd file in photoshop and the size is now different (28x46). An exrta pixel has been added 

This has caused many issues, especially when creating gifs, as the steps in the animation end up moving even so slightly by one pixel left or right when exporting the files from AI to photoshop.

I would be very grateful if anyone had any insight on these two topics.

Thank you!