We often use the rectangle three-point in order to create a rectangle that is not parallel or perpendicular to the working planes, or to create a rectangle through 3 points.
The issue is, and has been, that when you put the third point down, you get the green dot showing you're over a valid snap point, you click on that green dot, BUT when you're done, that third snap did NOT snap! So no matter what you do, that forth side of your rectangle is NEVER CONSTRAINED. Below is a video showing this issue (this was done in Inventor 2024):
https://app.screencast.com/UDMMWyYQuSV7k
When the 3rd point is snapped to something, MAKE IT CONSTRAINED TO THAT SOMETHING YOU SNAPPED ON.
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