RStudio Update Available dialogue box

This is a question about behaviour of RStudio that is unexpected and thus annoying, but I am not sure if it is serious enough for a bug report.

When RStudio prompts me to upgrade with the 'Update Available' dialogue box, clicking on the X to dismiss this window actually closes the program.

Closing the dialogue box should normally just dismiss the dialogue box, but here it seems to be functionally the same as choosing 'Quit and Download...' option. This seems to be an unexpected behaviour. I normally only make this mistake when I am in a hurry for some reason, which makes this very annoying.

Is this intentional for some reason? Is it likely to change in future versions?