@Emile S No you have not. Latest Xojo is 2019r3.
In this regard, 2019r3 appears to work the same as earlier versions.
I've been making more use of External Items in my projects. And although it is not documented as a feature, I find most times that if I collapse and expand again an External Item node in the Navigator, the Methods, Properties, etc. get refreshed. I'm just commenting here, not necessarily recommending it as a solution to your question.
@nicoláscanessa have you tried with File -> Revert to Saved? i have never used it, so please do backup of your project before
I do however use "Revert to Saved" regularly, when I know the project file(s) have changed (like after pulling from GitHub) - but I always make sure my current local changes have been saved and committed beforehand. "Revert to Saved" closes and reloads the project in one step. Not an ideal solution, but I'm used to it now.