This app has a version update pending 12hour

More than one developer has encountered this problem

there were several garmin server issues over the weekend, would suggest to just reapply the update to your app. 

Will re-uploading fix this problem?

Probably no

it's 9:30am Monday in Kansas, so people there are at work,  Depending on the issue - such as the forums in general, or something specific with approval, things could be fixed.  I'd give it a try as it only takes a few minutes.

we're in the 21st century, this is no longer a good excuse

Do you work 24/7 to support your apps?  The CIQ group isn't that big, with most located in Olathe Kansas, US

It doesn't look like the problems are within the scope of the CIQ team. It's more like some backend process or something like that. I'm sure there are ops or devops somewhere in Garmin 24/7.

Another way to fix this is ... well to fix this

If the same thing happens more than 10 times then I stop and fix it. Developers who manage their time better than me probably do it after 3 times...