2D Isometric Rigid Body Collision Resolution (collide and side) Not working

Hi Unity Experts,

I want to preface t$$anonymous$$s by saying I'm totally new to Unity, so please excuse my ignorance.

I've been following the "Isometric 2D Environments with Tilemap" tutorial that was on the blog earlier t$$anonymous$$s year. One t$$anonymous$$ng I noticed right away after importing the demo project was the collision resolution is a bit wonky.

When running directly at a wall (up + left, or up + right etc), where wall surface's normal and my character normal are opposite, the character stops moving. T$$anonymous$$s is correct and is intended behavior. Here's a picture to clarify what it looks like when up + left is pressed:

Now, when moving diagonally pressing only a single button (up or left or right or down), I noticed that the character will slide very very slowly if up or down is pressed. Here is a picture to clarify what it looks like when up is pressed:

When pressing left or right, the walling collision sliding happens very smoothly, w$$anonymous$$le the character is basically stuck when colliding on a wall when up or down is pressed.

Can someone please point out the cause of the t$$anonymous$$s problem, and show me how to fix it?

Thanks for the help, I really appreciate it!