A workaround I found is to click on the pane of the PDF, not the contents.
Well, technically you can click anywhere that is outside the PDF and it would get the hotkeys to work again, but clicking on the pane itself has allowed me to do things that are specific to that pane; an example would be to maximize using the Maximize Active Pane plugin, where you would need to have the PDF active in order to do so.
I do have a related concern however, Imma ask here in case if it’s impossible to fix/add for the devs also.
In Mac (and Windows depending on the touchpad), we can use the trackpad to zoom in and out on a page and PDF like we would with an iPad or phone, yet this functionality is absent in Obsidian’s PDF viewer; though we have the zoom in and out buttons, it’s just not the same IMO. Is this likely to be included in a future update or is this also unfixable?