question

Is it possible it was working before because you were exporting models without textures?

I have had to use the text editor work around since last year for textured models.

It's the same as before, sometimes works, sometimes doesn't. Just open and save the GTLF in visual studio code which will force the live reset/reload. Make sure you're in the scenery editor at the time. For model textures to update you need to build the package and reload it.
If you're having real issues try removing the cache directories to force a proper from scratch rebuild. This works 100% of the time.

I was updating textured models in the sim last week. I was under the impression that this was fixed with the SU10 beta which I have been using. They just released a new beta build and I suspect that the new build has made this broken again to where you have to use a text editor to make it work. I was definitely updating textured models though and you could see the model disappear and reload after export. Now it does nothing unless you use a text editor. To make this clear I am now on SU10 build 1.27.14.0

Now that I"ve updated my home computer to SU10 1.27.14.0 and SDK 19 I can't even get the models to update with the text editor workaround anymore. The model does not auto refresh at all anymore....hmmm.....

What cache directories are you speaking of? I've cleaned and rebuilt packages and have done all of those things and it still doesn't work. I was in the scenery editor too.....and I've manually changed the GTLF using text editor which usually works.