Anchor point glitch during removing unnecessary anchor points/Adobe illustrator (24.1)

There are more unexpected results when removing anchor points in 24.1

This is an example in 24.1 of a circle with a left or right anchor point removed.

Removing the left one gives a surprising good result, but removing the right point gives the result as in previous versions

I can see a difference between the 24.1 versions and previous Illustrator (CC) versions

Corner Anchor points become smooth when a point inbetween is removed.

I cannot recreate what is happening to you using Illustrator CC 2020 with Mojave. What version of Illustrator and what operating system are you using? Have you tried the test of the points I suggested in my first post? When working with the pen tool it is always possible to inadvertently create a curved point by using too much pressure on the mouse. The points will still appear like they're straight points as long as they are not dragged on.

It looks to me like the points on top are probably already curved points and the point you're removing is actually keeping the line's appearance of being straight by connecting the two points. The ones on the bottom are probably actually straight points themselves which is why the line stays straight when the excess point is removed. You can test this theory by selecting one of the top points using the direct selection tool (white arrow). If you see bezier handles spring out from those points when you selct them then that is proof that they were curved points all along. If they are curved points then the behavior you're describing is totally normal. You can change the curved points to straight points by clicking on the selected points with the Anchor Point Tool which is found under the Pen Tool in Illustrator's default tool panel.

Here is another video of this problem. So it's something that keep bothering me all the time 😞